The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
The Enhanced Interior Gateway Routing Protocol (EIGRP) is an enhanced version of IGRP developed by Cisco. This module describes the concepts and tasks you need to implement basic EIGRP configuration using Cisco IOS XR software. EIGRP uses distance vector routing technology, which specifies that a router need not know all the router and link relationships for the entire network. Each router advertises destinations with a corresponding distance and upon receiving routes, adjusts the distance and propagates the information to neighboring routes.
Multiprotocol Label Switching (MPLS) Layer 3 Virtual Private Network (VPN)
Site of Origin (SoO) Support
 Note |
For more information about EIGRP on the Cisco IOS XR software and complete descriptions of the EIGRP commands listed in this module, see the EIGRP Commands chapter in the Routing Command Reference for Cisco CRS Routers. To locate documentation for other commands that might appear while executing a configuration task, search online in the Cisco IOS XR software master command index. |
|
Release |
Modification |
|---|---|
|
Release 3.3.0 |
This feature was introduced. |
|
Release 3.4.0 |
Four-byte autonomous system (AS) number support was added. |
|
Release 3.5.0 |
IPv6 address family and IPv6 VPN routing and forwarding (VRF) address family support was added. IPv6 Provider Edge and IPv6 VPN Provider Edge Transport over Multiprotocol Label Switching Infrastructure support was added. |
|
Release 3.8.0 |
EIGRP Authentication Keychain feature was added. |
|
Release 4.3.0 |
Wide Metric Support feature was added |
You must be in a user group associated with a task group that includes the proper task IDs. The command reference guides include the task IDs required for each command. If you suspect user group assignment is preventing you from using a command, contact your AAA administrator for assistance.
The following restrictions are employed when running EIGRP on this version of Cisco IOS XR software:
The characters allowed for EIGRP process name are @ . # : - _ only.
Simple Network Management Protocol (SNMP) MIB is not supported.
Interface static routes are not automatically redistributed into EIGRP, because there are no network commands.
Metric configuration (either through the default-metric command or a route policy) is required for redistribution of connected and static routes.
Auto summary is disabled by default.
Stub leak maps are not supported.
To implement EIGRP, you need to understand the following concepts:
Enhanced Interior Gateway Routing Protocol (EIGRP) is an interior gateway protocol suited for many different topologies and media. EIGRP scales well and provides extremely quick convergence times with minimal network traffic.
EIGRP has very low usage of network resources during normal operation. Only hello packets are transmitted on a stable network. When a change in topology occurs, only the routing table changes are propagated and not the entire routing table. Propagation reduces the amount of load the routing protocol itself places on the network. EIGRP also provides rapid convergence times for changes in the network topology.
The distance information in EIGRP is represented as a composite of available bandwidth, delay, load utilization, and link reliability with improved convergence properties and operating efficiency. The fine-tuning of link characteristics achieves optimal paths.
The convergence technology that EIGRP uses is based on research conducted at SRI International and employs an algorithm referred to as the Diffusing Update Algorithm (DUAL). This algorithm guarantees loop-free operation at every instant throughout a route computation and allows all devices involved in a topology change to synchronize at the same time. Routers that are not affected by topology changes are not involved in recomputations. The convergence time with DUAL rivals that of any other existing routing protocol.
EIGRP offers the following features:
Fast convergence—The DUAL algorithm allows routing information to converge as quickly as any currently available routing protocol.
Partial updates—EIGRP sends incremental updates when the state of a destination changes, instead of sending the entire contents of the routing table. This feature minimizes the bandwidth required for EIGRP packets.
Neighbor discovery mechanism—This is a simple hello mechanism used to learn about neighboring routers. It is protocol independent.
Variable-length subnet masks (VLSMs).
Arbitrary route summarization.
Scaling—EIGRP scales to large networks.
The following key features are supported in the Cisco IOS XR implementation:
Support for IPv4 and IPv6 address families.
Provider Edge (PE)-Customer Edge (CE) protocol support with Site of Origin (SoO) and Border Gateway Protocol (BGP) cost community support.
PECE protocol support for MPLS and L2TPv3-based-IP L3VPNs.
EIGRP has the following four basic components:
Neighbor discovery or neighbor recovery
Reliable transport protocol
DUAL finite state machine
Protocol-dependent modules
Neighbor discovery or neighbor recovery is the process that routers use to dynamically learn of other routers on their directly attached networks. Routers must also discover when their neighbors become unreachable or inoperative. Neighbor discovery or neighbor recovery is achieved with low overhead by periodically sending small hello packets. As long as hello packets are received, the Cisco IOS XR software can determine that a neighbor is alive and functioning. After this status is determined, the neighboring routers can exchange routing information.
The reliable transport protocol is responsible for guaranteed, ordered delivery of EIGRP packets to all neighbors. It supports intermixed transmission of multicast and unicast packets. Some EIGRP packets must be sent reliably and others need not be. For efficiency, reliability is provided only when necessary. For example, on a multiaccess network that has multicast capabilities (such as Ethernet) it is not necessary to send hello packets reliably to all neighbors individually. Therefore, EIGRP sends a single multicast hello with an indication in the packet informing the receivers that the packet need not be acknowledged. Other types of packets (such as updates) require acknowledgment, which is indicated in the packet. The reliable transport has a provision to send multicast packets quickly when unacknowledged packets are pending. This provision helps to ensure that convergence time remains low in the presence of various speed links.
The DUAL finite state machine embodies the decision process for all route computations. It tracks all routes advertised by all neighbors. DUAL uses the distance information (known as a metric) to select efficient, loop-free paths. DUAL selects routes to be inserted into a routing table based on a calculation of the feasibility condition. A successor is a neighboring router used for packet forwarding that has a least-cost path to a destination that is guaranteed not to be part of a routing loop. When there are no feasible successors but there are neighbors advertising the destination, a recomputation must occur. This is the process whereby a new successor is determined. The amount of time required to recompute the route affects the convergence time. Recomputation is processor intensive; it is advantageous to avoid unneeded recomputation. When a topology change occurs, DUAL tests for feasible successors. If there are feasible successors, it uses any it finds to avoid unnecessary recomputation.
The protocol-dependent modules are responsible for network layer protocol-specific tasks. An example is the EIGRP module, which is responsible for sending and receiving EIGRP packets that are encapsulated in IP. It is also responsible for parsing EIGRP packets and informing DUAL of the new information received. EIGRP asks DUAL to make routing decisions, but the results are stored in the IP routing table. EIGRP is also responsible for redistributing routes learned by other IP routing protocols.
Cisco IOS XR software groups all EIGRP configuration under router EIGRP configuration mode, including interface configuration portions associated with EIGRP. To display EIGRP configuration in its entirety, use the show running-config router eigrp command. The command output displays the running configuration for the configured EIGRP instance, including the interface assignments and interface attributes.
The following examples show how to enter each of the configuration modes. From a mode, you can enter the ? command to display the commands available in that mode.
The following example shows how to enter router configuration mode:
The following example shows how to enter VRF configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# vrf customer1
RP/0/RP0/CPU0:router(config-eigrp-vrf)#
The following example shows how to enter IPv4 address family configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# address-family ipv4
RP/0/RP0/CPU0:router(config-eigrp-af)#
The following example shows how to enter IPv6 address family configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# address-family ipv6
RP/0/RP0/CPU0:router(config-eigrp-af)#
The following example shows how to enter IPv4 VRF address family configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# vrf customer1
RP/0/RP0/CPU0:router(config-eigrp-vrf)# address-family ipv4
RP/0/RP0/CPU0:router(config-eigrp-vrf-af)#
The following example shows how to enter IPv6 VRF address family configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# vrf customer1
RP/0/RP0/CPU0:router(config-eigrp-vrf)# address-family ipv6
RP/0/RP0/CPU0:router(config-eigrp-vrf-af)#
The following example shows how to enter interface configuration mode in IPv4 address family configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# address-family ipv4
RP/0/RP0/CPU0:router(config-eigrp-af)# interface GigabitEthernet 0/3/0/0
RP/0/RP0/CPU0:router(config-eigrp-af-if)#
The following example shows how to enter interface configuration mode in IPv6 VRF configuration mode:
RP/0/RP0/CPU0:router# configuration
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# vrf customer1
RP/0/RP0/CPU0:router(config-eigrp-vrf)# address-family ipv6
RP/0/RP0/CPU0:router(config-eigrp-vrf-af)# interface POS0/5/0/0
RP/0/RP0/CPU0:router(config-eigrp-vrf-af-if)#
EIGRP interfaces can be configured as either of the following types:
Active—Advertises connected prefixes and forms adjacencies. This is the default type for interfaces.
Passive—Advertises connected prefixes but does not form adjacencies. The passive command is used to configure interfaces as passive. Passive interfaces should be used sparingly for important prefixes, such as loopback addresses, that need to be injected into the EIGRP domain. If many connected prefixes need to be advertised, then the redistribution of connected routes with the appropriate policy should be used instead.
Routes from other protocols can be redistributed into EIGRP. A route policy can be configured along with the redistribute command. A metric is required, configured either through the default-metric command or under the route policy configured with the redistribute command to import routes into EIGRP.
A route policy allows the filtering of routes based on attributes such as the destination, origination protocol, route type, route tag, and so on. When redistribution is configured under a VRF, EIGRP retrieves extended communities attached to the route in the routing information base (RIB). The SoO is used to filter out routing loops in the presence of MPSL VPN backdoor links.
EIGRP uses the minimum bandwidth on the path to a destination network and the total delay to compute routing metrics. You can use the metric weights command to adjust the default behavior of EIGRP routing and metric computations. For example, this adjustment allows you to tune system behavior to allow for satellite transmission. EIGRP metric defaults have been carefully selected to provide optimal performance in most networks.
By default, the EIGRP composite metric is a 32-bit quantity that is a sum of the segment delays and lowest segment bandwidth (scaled and inverted) for a given route. For a network of homogeneous media, this metric reduces to a hop count. For a network of mixed media (FDDI, Ethernet, and serial lines running from 9600 bits per second to T1 rates), the route with the lowest metric reflects the most desirable path to a destination.
Mismatched K values (EIGRP metrics) can prevent neighbor relationships from being established and can negatively impact network convergence. The following example explains this behavior between two EIGRP peers (ROUTER-A and ROUTER-B).
The following error message is displayed in the console of ROUTER-B because the K values are mismatched:
RP/0/RP0/CPU0:Mar 13 08:19:55:eigrp[163]:%ROUTING-EIGRP-5-NBRCHANGE:IP-EIGRP(0) 1:Neighbor 11.0.0.20 (GigabitEthernet0/6/0/0) is down: K-value mismatch
Two scenarios occur in which this error message can be displayed:
The two routers are connected on the same link and configured to establish a neighbor relationship. However, each router is configured with different K values.
The following configuration is applied to ROUTER-A. The K values are changed with the metric weights command. A value of 2 is entered for the k1 argument to adjust the bandwidth calculation. The value of 1 is entered for the k3 argument to adjust the delay calculation.
hostname ROUTER-A!
interface GigabitEthernet0/6/0/0
ipv4 address 10.1.1.1 255.255.255.0
router eigrp 100
metric weights 0 2 0 1 0 0
interface GigabitEthernet0/6/0/0
The following configuration is applied to ROUTER-B. However, the metric weights command is not applied and the default K values are used. The default K values are 1, 0, 1, 0, and 0.
hostname ROUTER-B!
interface GigabitEthernet0/6/0/1
ipv4 address 10.1.1.2 255.255.255.0
router eigrp 100
interface GigabitEthernet0/6/0/1
The bandwidth calculation is set to 2 on ROUTER-A and set to 1 (by default) on ROUTER-B. This configuration prevents these peers from forming a neighbor relationship.
The K-value mismatch error message can also be displayed if one of the two peers has transmitted a “goodbye” message and the receiving router does not support this message. In this case, the receiving router interprets this message as a K-value mismatch.
The goodbye message is a feature designed to improve EIGRP network convergence. The goodbye message is broadcast when an EIGRP routing process is shut down to inform adjacent peers about the impending topology change. This feature allows supporting EIGRP peers to synchronize and recalculate neighbor relationships more efficiently than would occur if the peers discovered the topology change after the hold timer expired.
The following message is displayed by routers that run a supported release when a goodbye message is received:
RP/0/RP0/CPU0:Mar 13 09:13:17:eigrp[163]:%ROUTING-EIGRP-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.0.0.20 (GigabitEthernet0/6/0/0) is down: Interface Goodbye received
A Cisco router that runs a software release that does not support the goodbye message can misinterpret the message as a K-value mismatch and display the following message:
RP/0/RP0/CPU0:Mar 13 09:13:17:eigrp[163]:%ROUTING-EIGRP-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.0.0.20 (GigabitEthernet0/6/0/0) is down: K-value mismatchNote |
The receipt of a goodbye message by a nonsupporting peer does not disrupt normal network operation. The nonsupporting peer terminates the session when the hold timer expires. The sending and receiving routers reconverge normally after the sender reloads. |
By default, EIGRP packets consume a maximum of 50 percent of the link bandwidth, as configured with the bandwidth interface configuration command. You might want to change that value if a different level of link utilization is required or if the configured bandwidth does not match the actual link bandwidth (it may have been configured to influence route metric calculations).
You can also use a floating summary route when configuring the summary-address command. The floating summary route is created by applying a default route and administrative distance at the interface level. The following scenario illustrates the behavior of this enhancement.
Figure 1 shows a network with three routers, Router-A, Router-B, and Router-C. Router-A learns a default route from elsewhere in the network and then advertises this route to Router-B. Router-B is configured so that only a default summary route is advertised to Router-C. The default summary route is applied to interface 0/1 on Router-B with the following configuration:
RP/0/RP0/CPU0:router(config)# router eigrp 100
RP/0/RP0/CPU0:router(config-eigrp)# address-family ipv4
RP/0/RP0/CPU0:router(config-eigrp-af)# interface GigabitEthernet 0/3/0/0
RP/0/RP0/CPU0:router(config-eigrp-af-if)# summary-address 100.0.0.0 0.0.0.0
The configuration of the default summary route on Router-B sends a 0.0.0.0/0 summary route to Router-C and blocks all other routes, including the 10.1.1.0/24 route, from being advertised to Router-C. However, this configuration also generates a local discard route on Router-B, a route for 0.0.0.0/0 to the null 0 interface with an administrative distance of 5. When this route is created, it overrides the EIGRP learned default route. Router-B is no longer able to reach destinations that it would normally reach through the 0.0.0.0.0/0 route.
This problem is resolved by applying a floating summary route to the interface on Router-B that connects to Router-C. The floating summary route is applied by relating an administrative distance to the default summary route on the interface of Router-B with the following statement:
RP/0/RP0/CPU0:router(config-if)# summary-address 100 0.0.0.0 0.0.0.0 250
The administrative distance of 250, applied in the above statement, is now assigned to the discard route generated on Router-B. The 0.0.0.0/0, from Router-A, is learned through EIGRP and installed in the local routing table. Routing to Router-C is restored.
If Router-A loses the connection to Router-B, Router-B continues to advertise a default route to Router-C, which allows traffic to continue to reach destinations attached to Router-B. However, traffic destined for networks to Router-A or behind Router-A is dropped when the traffic reaches Router-B.
Figure 2 shows a network with two connections from the core: Router-A and Router-D. Both routers have floating summary routes configured on the interfaces connected to Router-C. If the connection between Router-E and Router-C fails, the network continues to operate normally. All traffic flows from Router-C through Router-B to the hosts attached to Router-A and Router-D.
However, if the link between Router-D and Router-E fails, the network may dump traffic into a black hole because Router-E continues to advertise the default route (0.0.0.0/0) to Router-C, as long as at least one link (other than the link to Router-C) to Router-E is still active. In this scenario, Router-C still forwards traffic to Router-E, but Router-E drops the traffic creating the black hole. To avoid this problem, you should configure the summary address with an administrative distance on only single-homed remote routers or areas in which only one exit point exists between the segments of the network. If two or more exit points exist (from one segment of the network to another), configuring the floating default route can cause a black hole to form.
Split horizon controls the sending of EIGRP update and query packets. When split horizon is enabled on an interface, update and query packets are not sent for destinations for which this interface is the next hop. Controlling update and query packets in this manner reduces the possibility of routing loops.
By default, split horizon is enabled on all interfaces.
Split horizon blocks route information from being advertised by a router on any interface from which that information originated. This behavior usually optimizes communications among multiple routing devices, particularly when links are broken. However, with nonbroadcast networks (such as Frame Relay and SMDS), situations can arise for which this behavior is less than ideal. For these situations, including networks in which you have EIGRP configured, you may want to disable split horizon.
You can adjust the interval between hello packets and the hold time.
Routing devices periodically send hello packets to each other to dynamically learn of other routers on their directly attached networks. This information is used to discover neighbors and learn when neighbors become unreachable or inoperative. By default, hello packets are sent every 5 seconds.
You can configure the hold time on a specified interface for a particular EIGRP routing process designated by the autonomous system number. The hold time is advertised in hello packets and indicates to neighbors the length of time they should consider the sender valid. The default hold time is three times the hello interval, or 15 seconds.
The EIGRP Stub Routing feature improves network stability, reduces resource usage, and simplifies stub router configuration.
Stub routing is commonly used in a hub-and-spoke network topology. In a hub-and-spoke network, one or more end (stub) networks are connected to a remote router (the spoke) that is connected to one or more distribution routers (the hub). The remote router is adjacent only to one or more distribution routers. The only route for IP traffic to follow into the remote router is through a distribution router. This type of configuration is commonly used in WAN topologies in which the distribution router is directly connected to a WAN. The distribution router can be connected to many more remote routers. Often, the distribution router is connected to 100 or more remote routers. In a hub-and-spoke topology, the remote router must forward all nonlocal traffic to a distribution router, so it becomes unnecessary for the remote router to hold a complete routing table. Generally, the distribution router need not send anything more than a default route to the remote router.
When using the EIGRP Stub Routing feature, you need to configure the distribution and remote routers to use EIGRP and configure only the remote router as a stub. Only specified routes are propagated from the remote (stub) router. The stub router responds to all queries for summaries, connected routes, redistributed static routes, external routes, and internal routes with the message “inaccessible.” A router that is configured as a stub sends a special peer information packet to all neighboring routers to report its status as a stub router.
Any neighbor that receives a packet informing it of the stub status does not query the stub router for any routes, and a router that has a stub peer does not query that peer. The stub router depends on the distribution router to send the proper updates to all peers.
This figure shows a simple hub-and-spoke configuration.
Without the stub feature, even after the routes that are sent from the distribution router to the remote router have been filtered or summarized, a problem might occur. If a route is lost somewhere in the corporate network, EIGRP could send a query to the distribution router, which in turn sends a query to the remote router even if routes are being summarized. If there is a problem communicating over the WAN link between the distribution router and the remote router, an EIGRP stuck in active (SIA) condition could occur and cause instability elsewhere in the network. The EIGRP Stub Routing feature allows a network administrator to prevent queries from being sent to the remote router.
Route policies comprise series of statements and expressions that are bracketed with the route-policy and end-policy keywords. Rather than a collection of individual commands (one for each line), the statements within a route policy have context relative to each other. Thus, instead of each line being an individual command, each policy or set is an independent configuration object that can be used, entered, and manipulated as a unit.
Each line of a policy configuration is a logical subunit. At least one new line must follow the then , else , and end-policy keywords. A new line must also follow the closing parenthesis of a parameter list and the name string in a reference to an AS path set, community set, extended community set, or prefix set (in the EIGRP context). At least one new line must precede the definition of a route policy or prefix set. A new line must appear at the end of a logical unit of policy expression and may not appear anywhere else.
This is the command to set the EIGRP metric in a route policy:
RP/0/RP0/CPU0:router(config-rpl)# set eigrp-metric bandwidth delay reliability loading mtu
This is the command to provide EIGRP offset list functionality in a route policy:
RP/0/RP0/CPU0:router(config-rpl)# add eigrp-metric bandwidth delay reliability loading mtu
A route policy can be used in EIGRP only if all the statements are applicable to the particular EIGRP attach point. The following commands accept a route policy:
default-information allowed—Match statements are allowed for destination. No set statements are allowed.
route-policy—Match statements are allowed for destination, next hop, and tag. Set statements are allowed for eigrp-metric and tag.
redistribute—Match statements are allowed for destination, next hop, source-protocol, tag and route-type. Set statements are allowed for eigrp-metric and tag.
The range for setting a tag is 0 to 255 for internal routes and 0 to 4294967295 for external routes.
The EIGRP MPLS and IP VPN PE-CE Site-of-Origin (SoO) feature introduces the capability to filter Multiprotocol Label Switching (MPLS) and IP Virtual Private Network (VPN) traffic on a per-site basis for EIGRP networks. SoO filtering is configured at the interface level and is used to manage MPLS and IP VPN traffic and to prevent transient routing loops from occurring in complex and mixed network topologies.
The configuration of the SoO extended community allows routers that support this feature to identify the site from which each route originated. When this feature is enabled, the EIGRP routing process on the PE or CE router checks each received route for the SoO extended community and filters based on the following conditions:
If a route is received with an associated SoO value that matches the SoO value that is configured on the receiving interface, the route is filtered out because it was learned from another PE router or from a backdoor link. This behavior is designed to prevent routing loops.
If a route is received with an associated SoO value that does not match the SoO value that is configured on the receiving interface, the route is accepted into the EIGRP topology table so that it can be redistributed into BGP.
If the route is already installed in the EIGRP topology table but is associated with a different SoO value, the SoO value from the topology table is used when the route is redistributed into BGP.
If a route is received without a SoO value, the route is accepted into the EIGRP topology table, and the SoO value from the interface that is used to reach the next-hop CE router is appended to the route before it is redistributed into BGP.
When BGP and EIGRP peers that support the SoO extended community receive these routes, they also receive the associated SoO values and pass them to other BGP and EIGRP peers that support the SoO extended community. This filtering is designed to prevent transient routes from being relearned from the originating site, which prevents transient routing loops from occurring.
In conjunction with BGP cost community, EIGRP, BGP, and the RIB ensure that paths over the MPLS VPN core are preferred over backdoor links.
For MPLS and IP VPN and SoO configuration information, see Implementing MPLS Layer 3 VPNs in the Cisco IOS XR Multiprotocol Label Switching Configuration Guide.
The SoO configuration in EIGRP network can be used to manipulate routes using the SoO match condition in the routing policy. The egress interface of a PE router is used to compare and manipulate routes based on the SoO configuration on the remote PE router.
In the following topology, CE1, CE2 and CE3 are the customer edge routers. PE1 and PE2 are the provider edge routers. By default, CE1 will use PE1->PE2 to reach CE3.To configure CE1 to use CE2 to reach CE3, the metric advertised by PE1 must be increased.
The routing policy on PE1 manipulates routes received from CE3 via PE2, by using the SoO match condition. With this feature added, PE1 can increase the metric while advertising routes to CE1.
/*SoO tag is assigned on PE2 router*/
router(config)#interface GigabitEthernet0/0/0/11
router (config-if)#site-of-origin 33.33.33.33:33
/* A route-policy defined on PE1 */
router(config)#route-policy test
router(config-rpl)#if extcommunity soo matches-any (33.33.33.33:33) then
router(config-rpl-if)#set eigrp-metric 2121212121 333333333 245 250 1455
router(config-rpl-if)#endif
router(config-rpl)#end-policy
router (config)#commit
router (config)#
router(config)#interface GigabitEthernet0/3/0/1
router (config-if)#route-policy test out
/*A route with poor metric advertised by PE1 is installed into CE1’s routing table for SoO of site C3. */
router#show eigrp topology 6:6::1/128
IPv6-EIGRP AS(100): Topology entry for 6:6::1/128
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 15539149614794, RIB is 4294967295 Routing Descriptor Blocks: fe80::226:98ff:fe24:5109 (GigabitEthernet0/0/0/15), from fe80::226:98ff:fe24:5109, Send flag is 0x0
Composite metric is (15539149614794/15539148304382), Route is Internal Vector metric:
Minimum bandwidth is 1000000 Kbit
Total delay is 237108596182784 picoseconds
Reliability is 245/255
Load is 250/255
Minimum MTU is 1455
Hop count is 2
Originating router is 2.2.2.2
Extended Community:
SoO:33.33.33.33:33
This feature is applicable to both ipv4 as well as ipv6.
All types of SoO(IP-Address, ASN2, ASN4) are supported.
IPv6 Provider Edge (6PE) and IPv6 VPN Provider Edge (6VPE) uses the existing IP and Multiprotocol Label Switching (MPLS) IPv4 core infrastructure for IPv6 transport. 6PE and 6VPE enable IPv6 sites to communicate with each other over an IP and MPLS IPv4 core network using MPLS label switched paths (LSPs).
EIGRP is an Interior Gateway Protocol (IGP) that supports the 6PE or 6VPE provider edge-to-customer edge protocol by supporting the configuration of IPv6 address families in EIGRP VRF and exchanging IPv6 routing updates in the L3VPN environment
For detailed information on configuring 6PE and 6VPE over MPLS and IP, see MPLS Configuration Guide for the Cisco CRS Routers.
EIGRP authentication using keychain introduces the capability to authenticate EIGRP protocol packets on a per-interface basis. The EIGRP routing authentication provides a mechanism to authenticate all EIGRP protocol traffic on one or more interfaces, based on Message Digest 5 (MD5) authentication.
The EIGRP routing authentication uses the Cisco IOS XR software security keychain infrastructure to store and retrieve secret keys and to authenticate incoming and outgoing traffic on a per-interface basis.
The Cisco IOS XR Enhanced Interior Gateway Routing Protocol (EIGRP) implementation is enhanced to perform wide metric computation. This enhancement is to support high bandwidth interfaces.
A new EIGRP command is added and existing EIGRP commands are enhanced to support wide metric computation feature.
metric rib-scale —This command was introduced.
metric —The picoseconds keyword was added.
metric weights —Support was added for the k6 constant.
show eigrp interfaces —The command output was modified to display relevant wide metric information.
show eigrp neighbors —The command output was modified to display relevant wide metric information.
show eigrp topology —The command output was modified to display relevant wide metric information.
show protocols —The command output was modified to display relevant wide metric information.
Note |
If there is a combination of IOS and IOS-XR PE devices in the network, then the EIGRP wide metric must be disabled in IOS-XR PE device. This is because the method of calculating metrics in L3VPN design between IOS and IOS-XR. |
EIGRP supports Bidirectional forwarding detection (BFD) for link failure detection.
BFD provides low-overhead, short-duration detection of failures in the path between adjacent forwarding engines. BFD allows a single mechanism to be used for failure detection over any media and at any protocol layer, with a wide range of detection times and overhead. The fast detection of failures provides immediate reaction to failure in the event of a failed link or neighbor.
This section contains instructions for the following tasks:
Note |
To save configuration changes, you must commit changes when the system prompts you. |
This task enables EIGRP routing and establishes an EIGRP routing process.
Although you can configure EIGRP before you configure an IP address, no EIGRP routing occurs until at least one IP address is configured.
| Command or Action | Purpose | |||
|---|---|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
||
| Step 2 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
||
| Step 3 |
address-family { ipv4 | ipv6 } Example: |
Enters an address family configuration mode. |
||
| Step 4 |
router-id id Example: |
(Optional) Configures a router-id for an EIGRP process.
|
||
| Step 5 |
default-metric bandwidth delay reliability loading mtu Example: |
(Optional) Sets metrics for an EIGRP process. |
||
| Step 6 |
distance internal-distance external-distance Example: |
(Optional) Allows the use of two administrative distances—internal and external—that could be a better route to a node. |
||
| Step 7 |
interface type interface-path-id Example: |
Defines the interfaces on which the EIGRP routing protocol runs. |
||
| Step 8 |
holdtime seconds Example: |
(Optional) Configures the hold time for an interface.
|
||
| Step 9 |
bandwidth-percent percent Example: |
(Optional) Configures the percentage of bandwidth that may be used by EIGRP on an interface. |
||
| Step 10 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
This task configures route summarization for an EIGRP process.
You can configure a summary aggregate address for a specified interface. If any more specific routes are in the routing table, EIGRP advertises the summary address from the interface with a metric equal to the minimum of all more specific routes.
Note |
You should not use the summary-address summarization command to generate the default route (0.0.0.0) from an interface. This command creates an EIGRP summary default route to the null 0 interface with an administrative distance of 5. The low administrative distance of this default route can cause this route to displace default routes learned from other neighbors from the routing table. If the default route learned from the neighbors is displaced by the summary default route or the summary route is the only default route present, all traffic destined for the default route does not leave the router; instead, this traffic is sent to the null 0 interface, where it is dropped. The recommended way to send only the default route from a given interface is to use a route-policy command. |
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
router eigrp as-number Example: |
Specifies the AS number of the routing process to configure an EIGRP routing process. |
| Step 3 |
address-family { ipv4 | ipv6 } Example: |
Enters an address family configuration mode, IPv4 or IPv6. |
| Step 4 |
route-policy name out Example: |
Applies a routing policy to updates advertised to or received from an EIGRP neighbor. |
| Step 5 |
interface type interface-path-id Example: |
Defines the interfaces on which the EIGRP routing protocol runs. |
| Step 6 |
summary-address ip-address { / length | mask } [ admin-distance ] Example: |
Configures a summary aggregate address for the specified EIGRP interface. |
| Step 7 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
This task explains how to redistribute routes, apply limits on the number of routes, and set timers for nonstop forwarding.
| Command or Action | Purpose | |||
|---|---|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
||
| Step 2 |
router eigrp as-number Example: |
Specifies the AS number of the routing process to configure an EIGRP routing process. |
||
| Step 3 |
address-family { ipv4 | ipv6 } Example: |
Enters an address family configuration mode, IPv4 or IPv6. |
||
| Step 4 |
redistribute {{ bgp | connected | isis | ospf | ospfv3 | rip | static } [ as-number ]} [ route-policy name ] Example: |
Redistributes the routes from the specified protocol and AS number to the EIGRP process. Optionally, the redistributed routes can be filtered into the EIGRP process by providing the route policy. |
||
| Step 5 |
redistribute maximum-prefix maximum [ threshold ] [[ dampened ] [ reset-time minutes ] [ restart minutes ] [ restart-count number ] | [ warning-only ]] Example: |
Limits the maximum number of prefixes that are redistributed to the EIGRP process.
|
||
| Step 6 |
timers nsf route-hold seconds Example: |
Sets the timer that determines how long an NSF-aware EIGRP router holds routes for an inactive peer. |
||
| Step 7 |
maximum paths maximum Example: |
Controls the maximum number of parallel routes that the EIGRP can support. |
||
| Step 8 |
maximum-prefix maximum [ threshold ] [[ dampened ] [ reset-time minutes ] [ restart minutes ] [ restart-count number ] | [ warning-only]] Example: |
Limits the number of prefixes that are accepted under an address family by EIGRP. |
||
| Step 9 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
This task defines a route policy and shows how to attach it to an EIGRP process.
A route policy definition consists of the route-policy command and name argument followed by a sequence of optional policy statements, and then closed with the end-policy command.
A route policy is not useful until it is applied to routes of a routing protocol.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
route-policy name Example: |
Defines a route policy and enters route-policy configuration mode. |
| Step 3 |
set eigrp-metric bandwidth delay reliability load mtu Example: |
(Optional) Sets the EIGRP metric attribute. |
| Step 4 |
end-policy Example: |
Ends the definition of a route policy and exits route-policy configuration mode. |
| Step 5 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
| Step 6 |
configure Example: |
Enters global configuration mode. |
| Step 7 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
| Step 8 |
address-family { ipv4 | ipv6 } Example: |
Enters an address family configuration mode. |
| Step 9 |
route-policy route-policy-name { in | out } Example: |
Applies a routing policy to updates advertised to or received from an EIGRP neighbor. |
| Step 10 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
This task configures the distribution and remote routers to use an EIGRP process for stub routing.
Note |
EIGRP stub routing should be used only on remote routers. A stub router is defined as a router connected to the network core or distribution layer through which core transit traffic should not flow. A stub router should not have any EIGRP neighbors other than distribution routers. Ignoring this restriction causes undesirable behavior. |
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
| Step 3 |
address-family { ipv4 | ipv6 } Example: |
Enters an address family configuration mode. |
| Step 4 |
stub [ receive-only | {[ connected ] [ redistributed ] [ static ] [ summary ]}] Example: |
Configures a router as a stub for EIGRP. |
| Step 5 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
| Step 6 |
show eigrp [ ipv4 | ipv6 ] neighbors [ as-number ] [ detail ] [ type interface-path-id | static ] Example: |
Verifies that a remote router has been configured as a stub router with EIGRP. The last line of the output shows the stub status of the remote or spoke router. |
Perform this task to configure EIGRP on the provider edge (PE) and establish provider edge-to-customer edge (PE-CE) communication using EIGRP.
| Command or Action | Purpose | |||
|---|---|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
||
| Step 2 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
||
| Step 3 |
vrf vrf-name Example: |
Configures a VPN routing and forwarding (VRF) instance. |
||
| Step 4 |
address-family { ipv4 | ipv6 } Example: |
Enters a VRF address family configuration mode. |
||
| Step 5 |
router-id router-id Example: |
Configures a router ID for the EIGRP process. |
||
| Step 6 |
autonomous-system as-number Example: |
Configures an EIGRP routing process to run within the VRF instance.
|
||
| Step 7 |
redistribute {{ bgp | connected | isis | ospf | ospfv3 | rip | static } [ as-number | instance-name ]} [ route-policy name ] Example: |
Injects routes from one routing domain into EIGRP. |
||
| Step 8 |
interface type interface-path-id Example: |
Configures the interface on which EIGRP the routing protocol runs. |
||
| Step 9 |
site-of-origin { as-number:number | ip-address : number } Example: |
Configures the site-of-origin (SoO) filtering on the EIGRP interface. |
||
| Step 10 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
Perform this task to redistribute BGP routes into EIGRP.
Typically, EIGRP routes are redistributed into BGP with extended community information appended to the route. BGP carries the route over the VPN backbone with the EIGRP-specific information encoded in the BGP extended community attributes. After the peering customer site receives the route, EIGRP redistributes the BGP route then extracts the BGP extended community information and reconstructs the route as it appeared in the original customer site.
When redistributing BGP routes into EIGRP, the receiving provider edge (PE) EIGRP router looks for BGP extended community information. If the information is received, it is used to recreate the original EIGRP route. If the information is missing, EIGRP uses the configured default metric value.
If the metric values are not derived from the BGP extended community and a default metric is not configured, the route is not advertised to the customer edge (CE) router by the PE EIGRP. When BGP is redistributed into BGP, metrics may not be added to the BGP prefix as extended communities; for example, if EIGRP is not running on the other router. In this case, EIGRP is redistributed into BGP with a “no-metrics” option.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
| Step 3 |
vrf vrf-name Example: |
Configures a VRF instance. |
| Step 4 |
address-family { ipv4 | ipv6 } Example: |
Enters a VRF address family configuration mode. |
| Step 5 |
redistribute {{ bgp | connected | isis | ospf | ospfv3 | rip | static } [ as-number | instance-name ]} [ route-policy name ] Example: |
Injects routes from one routing domain into EIGRP. |
| Step 6 |
route-policy route-policy-name { in | out } Example: |
Applies a routing policy to updates advertised to or received from an EIGRP neighbor. |
| Step 7 |
default-metric bandwidth delay reliability loading mtu Example: |
Configures metrics for EIGRP. |
| Step 8 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
The commands in this section are used to log neighbor adjacency changes, monitor the stability of the routing system, and help detect problems.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
| Step 3 |
address-family [ ipv4 | ipv6 ] Example: |
Enters an address family configuration mode. |
| Step 4 |
log-neighbor-changes Example: |
Enables the logging of changes in EIGRP neighbor adjacencies. |
| Step 5 |
log-neighbor-warnings Example: |
Enables the logging of EIGRP neighbor warning messages. |
| Step 6 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
| Step 7 |
clear eigrp [ as-number ] [ vrf { vrf | all }] [ ipv4 | ipv6 ] neighbors [ ip-address | type interface-path-id ] Example: |
Deletes EIGRP and VPN neighbor entries from the appropriate table. |
| Step 8 |
clear eigrp [ as-number ] [ vrf { vrf | all }] [ ipv4 | ipv6 ] topology [ prefix mask ] [ prefix / length ] Example: |
Deletes EIGRP and VRF topology entries from the appropriate tab. |
| Step 9 |
show eigrp [ as-number ] [ vrf { vrf | all }] [ ipv4 | ipv6 ] accounting Example: |
Displays prefix accounting information for EIGRP processes. |
| Step 10 |
show eigrp [ as-number ] [ vrf { vrf | all }][ ipv4 | ipv6 ] interfaces [ type interface-path-id ] [ detail ] Example: |
Displays information about interfaces configured for EIGRP. |
| Step 11 |
show eigrp [ as-number ] [ vrf { vrf | all }] [ ipv4 | ipv6 ] neighbors [ detail ] [ type interface-path-id | static ] Example: |
Displays the neighbors discovered by EIGRP. |
| Step 12 |
show protocols eigrp [ vrf vrf-name ] Example: |
Displays information about the EIGRP process configuration. |
| Step 13 |
show eigrp [ as-number ] [ vrf { vrf | all }] [ ipv4 | ipv6 ] topology [ ip-address mask ] [ active | all-links | detail-links | pending | summary | zero-successors ] Example: |
Displays entries in the EIGRP topology table. |
| Step 14 |
show eigrp [ as-number ] [ vrf { vrf | all }] [ ipv4 | ipv6 ] traffic Example: |
Displays the number of EIGRP packets sent and received. |
Perform the following tasks to configure an authentication keychain on EIGRP interfaces.
Perform this task to configure an authentication keychain for an IPv4/IPv6 interface on a default VRF.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
| Step 3 |
address-family { ipv4 | ipv6 } Example: |
Enters a VRF address family configuration mode. |
| Step 4 |
interface type interface-path-id Example: |
Configures the interface on which EIGRP the routing protocol runs. |
| Step 5 |
authentication keychain keychain-name Example: |
Authenticates all EIGRP protocol traffic on the interface, based on the MD5 algorithm. |
| Step 6 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
Perform this task to configure an authentication keychain for an IPv4/IPv6 interface on a nondefault VRF.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
router eigrp as-number Example: |
Specifies the autonomous system number of the routing process to configure an EIGRP routing process. |
| Step 3 |
vrf vrf-name Example: |
Creates a VRF instance and enters VRF configuration mode. |
| Step 4 |
address-family { ipv4 | ipv6 } Example: |
Enters a VRF address family configuration mode. |
| Step 5 |
interface type interface-path-id Example: |
Configures the interface on which EIGRP runs. |
| Step 6 |
authentication keychain keychain-name Example: |
Authenticates all EIGRP protocol traffic on the interface, based on the MD5 algorithm. |
| Step 7 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
EIGRP typically broadcasts or multicasts routing updates. For security reasons, you can opt to configure static neighbors in the EIGRP routing process, forcing EIGRP to communicate to specified neighbors using unicast. When you specify a static neighbor relationship over a particular interface, EIGRP disables the processing of multicast EIGRP packets on the specified interface. This ensures that EIGRP does not send nor process received multicast EIGRP traffic on an interface which has a static neighbor defined under the EIGRP routing process.
In cases where the neighbors are not adjacent, normal EIGRP peering mechanisms cannot be used to exchange EIGRP information. In order to support this type of network, EIGRP provides the neighbor command, which allows remote neighbors to be configured and sessions established though unicast packet transmission. However, as the number of forwarders needing to exchange EIGRP information over the networking cloud increases, unicast EIGRP neighbor definitions may become cumbersome to manage. Each neighbor must be manually configured, resulting in increased operational costs. To better accommodate deployment of these topologies, ease configuration management, and reduce operational costs, the Dynamic Neighbors feature provides support for the dynamic discovery of remote unicast (referred to as “remote neighbors”). Remote neighbor support allows EIGRP peering to one or more remote neighbors, which may not be known at the time the device is configured, thus reducing configuration management.
In the topology illustrated below, ASA behaves as a hub and the other routers (2921s, 7010s) act as spokes. The 2921's and 7010's must not peer with each other, and there must never be a time where a packet (data traffic) is routed in this path: ASA > 2921.3 > 2921.4. To support this type of network, EIGRP allows you to configure static neighbors and establish sessions using unicast packet transmission. Thus, in this topology, 2921s and 7010s peer with ASA using neighbor command and ASA is configured to dynamically discover remote neighbors.
When using remote unicast-listen or remote multicast-group neighbor configurations, EIGRP neighbor IP addresses are not predefined, and neighbors may be many hops away. A device with this configuration could peer with any device that sends a valid HELLO packet. Because of security considerations, this open aspect requires policy capabilities to limit peering to valid devices and to restrict the number of neighbors in order to limit resource consumption. This capability is accomplished using the following manually configured parameters, and takes effect immediately.
When the allow-list or max-neighbors configurations are changed, any existing remote EIGRP sessions that are no longer allowed by the new configuration will be removed automatically and immediately. Pre-existing neighbors that are still allowed by the new configuration will not be affected.
The following terms are used when describing neighbor types:
For configurations in which multiple remote neighbors peer with a single hub (point-to-point), the hub can be configured for remote unicast-listen peering using the remote-neighbors command to allow the remote neighbors to peer with the hub without having to manually configure the remote neighbor IP addresses on the hub. When configured with this command, the hub device:
A single unicast address can only be configured to a single remote static neighbor for a given address-family. You cannot configure a second remote static neighbor using the same unicast address, on a different interface. EIGRP configuration of remote neighbors under different address families is unrestricted.
A single interface can be configured under a single address family with a single unicast-listen remote-neighbors command and with any number of static and remote static neighbors (each using a different unicast address).
Static neighbors configured with the neighbor <address> or neighbor <address> remote commands take precedence over the remote neighbors created as a result of the remote-neighbors command. If the remote address of an incoming unicast EIGRP connection matches both a static neighbor and the remote unicast-listen neighbor access list, the static neighbor is used and no remote unicast-listen neighbor is created. If you configure a new static neighbor while a remote neighbor for the same remote address already exists, EIGRP automatically removes the remote unicast-listen neighbor.
When configuring an EIGRP unicast neighbor, the neighbor statement is required on both ends (hub and spoke) of the neighbor relationship in the EIGRP routing process that operate in the same autonomous system.
Ensure that when using unicast-listen mode, IP connectivity (reachability) exists between devices that need to do remote peering.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure Example: |
Enters global configuration mode. |
| Step 2 |
router eigrp AS Number Example: |
Enables an EIGRP router instance. |
| Step 3 |
address-family { ipv4 | ipv6 } Example: |
Specifies either an IPv4 or IPv6 address family unicast and enters address family configuration submode. |
| Step 4 |
interface type interface-path-id Example: |
Configures an interface and enters the interface configuration mode. |
| Step 5 |
remote-neighbor unicast-listen {[allow-list route policy name] [max-neighbors maximum remote peers]} Example: |
|
| Step 6 |
Use the commit or end command. |
commit —Saves the configuration changes and remains within the configuration session.
|
| Step 7 |
sh run router eigrp |
|
The following examples show how to configure both devices (hub and spoke) involved in the neighbor relationship.
RP/0/RSP0/CPU0:HUB(config)#router eigrp 100
RP/0/RSP0/CPU0:HUB(config-eigrp)#address-family ipv4
RP/0/RSP0/CPU0:HUB(config-eigrp-af)#int g0/0/0/3
RP/0/RSP0/CPU0:HUB(config-eigrp-af-if)#exit
RP/0/RSP0/CPU0:HUB(config-eigrp-af)#interface gigabitEthernet 0/0/0/3
RP/0/RSP0/CPU0:HUB(config-eigrp-af-if)#remote-neighbor unicast-listen
RP/0/RSP0/CPU0:HUB(config-eigrp-af-if)#commit
RP/0/RSP0/CPU0:spoke(config)#router eigrp 100
RP/0/RSP0/CPU0:spoke(config-eigrp)#address-family ipv4
RP/0/RSP0/CPU0:spoke(config-eigrp-af)#interface g0/0/0/3
RP/0/RSP0/CPU0:spoke(config-eigrp-af-if)#neighbor 21.21.21.1 remote 10
RP/0/RSP0/CPU0:spoke(config-eigrp-af-if)#commit
RP/0/RSP0/CPU0:spoke#sh run router eigrp
Fri Aug 8 08:47:48.556 UTC
router eigrp 100
address-family ipv4
interface GigabitEthernet0/0/0/3
neighbor 21.21.21.1 remote 10! !!
This section provides the following configuration examples:
The following example shows how to configure EIGRP with a policy that filters incoming routes. This is a typical configuration for a router that has just one neighbor, but advertises other connected subnets.
router eigrp 144
address-family ipv4
metric maximum-hops 20
router-id 10.10.9.4
route-policy GLOBAL_FILTER_POLICY in
log-neighbor-changes
log-neighbor-warnings
interface Loopback0
!
interface GigabitEthernet 0/2/0/0
passive-interface
!
interface GigabitEthernet 0/6/0/0
hello-interval 8
hold-time 30
summary-address 10.0.0.0 255.255.0.0
!The following example shows how to configure an EIGRP stub. Stub operation allows only connected, static, and summary routes to be advertised to neighbors.
router eigrp 200
address-family ipv4
stub connected static summary
router-id 172.16.82.22
log-neighbor-changes
log-neighbor-warnings
redistribute connected route-policy CONN_POLICY
interface GigabitEthernet0/6/0/0
passive-interface
neighbor 10.0.0.31
!
interface GigabitEthernet0/6/0/1
passive-interface
neighbor 10.0.1.21
!
!
!
The following example shows how to configure EIGRP to operate as a PE-CE protocol on a PE router. The configuration is under VRF CUSTOMER_1. A maximum prefix is typically configured to ensure that one set of customer routes do not overwhelm the EIGRP process.
router eigrp 500
vrf CUSTOMER_1
address-family ipv4
timers nsf route-hold 300
router-id 172.16.6.11
maximum-prefix 450 70
default-metric 200000 10000 195 10 1500
log-neighbor-changes
log-neighbor-warnings
redistribute maximum-prefix 350 70
redistribute bgp 1.65500 route-policy SITE_1_POLICY
interface GigabitEthernet 0/4/0/5
neighbor 10.22.1.1
!
!
!
The following example shows how to configure an authentication keychain for an IPv4 interface on a nondefault VRF:
config
router eigrp 100
vrf vrf1
address-family ipv4
interface POS 0/1/0/0
authentication keychain key1
The following example shows how to configure an authentication keychain for an IPv6 interface on a default VRF:
config
router eigrp 100
address-family ipv6
interface POS 0/1/0/0
authentication keychain key2
The following sections provide references related to implementing EIGRP.
|
Related Topic |
Document Title |
|---|---|
|
EIGRP commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples |
Routing Command Reference for Cisco CRS Routers |
|
MPLS VPN support for EIGRP feature information |
Implementing MPLS Layer 3 VPNs module and Implementing MPLS Layer 2 VPNs module in MPLS Configuration Guide for the Cisco CRS Routers |
|
Site of Origin (SoO) support for EIGRP feature information |
Implementing MPLS Traffic Engineering on Cisco IOS XR Softwaremodule in MPLS Configuration Guide for the Cisco CRS Routers |
|
MIB Reference |
Cisco Carrier Routing System and Cisco XR 12000 Series Router MIB Support Guide. |
|
Standards |
Title |
|---|---|
|
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
— |
|
MIBs |
MIBs Link |
|---|---|
| — |
To locate and download MIBs using Cisco IOS XR software, use the Cisco MIB Locator found at the following URL and choose a platform under the Cisco Access Products menu: https://mibs.cloudapps.cisco.com/ITDIT/MIBS/servlet/index |
|
RFCs |
Title |
|---|---|
|
No new or modified RFCs are supported by this feature, and support for existing standards has not been modified by this feature. |
— |
|
Description |
Link |
|---|---|
|
The Cisco Technical Support website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content. |
Feedback