- MPLS Virtual Private Networks
- Multiprotocol BGP MPLS VPN
- MPLS VPN OSPF PE and CE Support
- MPLS VPN Support for EIGRP Between PE and CE
- IPv6 VPN over MPLS
- Assigning an ID Number to an MPLS VPN
- MPLS VPN Half-Duplex VRF
- MPLS VPN Show Running VRF
- MPLS VPN VRF CLI for IPv4 and IPv6 VPNs
- MPLS VPN BGP Local Convergence
- MPLS VPN Route Target Rewrite
- MPLS VPN Per VRF Label
- Multi-VRF Selection Using Policy-Based Routing
- MPLS VPN VRF Selection Using Policy-Based Routing
- VRF Aware System Message Logging
- MPLS VPN 6VPE per VRF Label
- Multi-VRF Support
- BGP Best External
- BGP PIC Edge for IP and MPLS-VPN
- MPLS over GRE
- Dynamic Layer 3 VPNs with Multipoint GRE Tunnels
- MPLS VPN 6VPE Support Over IP Tunnels
Contents
- MPLS VPN BGP Local Convergence
- Finding Feature Information
- Prerequisites for MPLS VPN BGP Local Convergence
- Restrictions for MPLS VPN BGP Local Convergence
- Information About MPLS VPN BGP Local Convergence
- How Link Failures Are Handled with BGP
- How Links Are Handled with the MPLS VPN BGP Local Convergence Feature
- How Link Failures Are Detected
- How to Configure MPLS VPN BGP Local Convergence
- Configuring MPLS VPN BGP Local Convergence with IPv4
- Configuring MPLS VPNBGP Local Convergence with IPv6
- Examples
- Troubleshooting Tips
- Configuration Examples for MPLS VPN BGP Local Convergence
- Examples: MPLS VPN BGP Local Convergence
- Examples: MPLS VPN BGP Local Convergence for 6VPE 6PE
- Additional References
- Feature Information for MPLS VPN BGP Local Convergence
MPLS VPN BGP Local Convergence
This document provides information about reducing the downtime of a provider edge (PE) to customer edge (CE) link failure. It describes how to reroute PE-egress traffic onto a backup path to the CE before the Border Gateway Protocol (BGP) has reconverged. The MPLS VPN BGP Local Convergence feature is also referred to as “local protection.” This document explains how to use PE-CE local convergence.
 Note | The MPLS VPN BGP Local Convergence feature affects only traffic exiting the Virtual Private Network (VPN). Therefore, it cannot fully protect traffic end-to-end by itself. |
- Finding Feature Information
- Prerequisites for MPLS VPN BGP Local Convergence
- Restrictions for MPLS VPN BGP Local Convergence
- Information About MPLS VPN BGP Local Convergence
- How to Configure MPLS VPN BGP Local Convergence
- Configuration Examples for MPLS VPN BGP Local Convergence
- Additional References
- Feature Information for MPLS VPN BGP Local Convergence
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for MPLS VPN BGP Local Convergence
- Before MPLS VPN BGP Local Convergence link protection can be enabled, the customer site must be connected to the provider site by more than one path.
- Both the main forwarding path and the redundant backup path must have been installed within Border Gateway Protocol (BGP), and BGP must support lossless switchover between operational paths.
- Any of the supported routing protocols can be used between the provider edge (PE) and customer edge (CE) as long as the path is redistributed into BGP. The supported protocols for IPv4 are External BGP (eBGP), Routing Information Protocol (RIP), Enhanced Interior Gateway Routing Protocol (EIGRP), Open Shortest Path First (OSPF), and static routing. The supported protocols for IPv6 are eBGP and static routing.
- All PE devices that are serving as backup to the link must have assigned a unique route distinguisher to each virtual routing and forwarding (VRF) table involved with the link to ensure that the route reflectors advertise all available paths.
- Although not required the backup PE (shown as “PE2” in the figure below) should run the same Cisco software release that is running on the PE (“PE 1”) whose link with the CE is protected.
Restrictions for MPLS VPN BGP Local Convergence
- The MPLS VPN BGP Local Convergence feature affects only traffic exiting the Virtual Private Network (VPN). Therefore, it cannot fully protect traffic end-to-end by itself.
- This link protection cannot be initiated during a high availability (HA) stateful switchover (SSO). But links already configured with this protection before the switchover begins will remain protected after the switchover.
- If you perform an in-service software downgrade from an image that does include this link protection to an image that does not support this feature, active protection will be halted when Border Gateway Protocol (BGP) routes are refreshed.
- Any next-hop core tunneling technology that is supported by BGP is also supported for protection, including Multiprotocol Label Switching (MPLS), IP/Layer 2 Tunneling Protocol version 3 (L2TPv3), and IP/generic routing encapsulation (GRE). Enabling a Carrier Supporting Carrier (CSC) protocol between the provider edge (PE) and customer edge (CE) is also supported. Interautonomous system option A (back-to-back VRF) is supported because it is essentially the same as performing the PE-CE link protection in both autonomous systems. However, interautonomous system options B and C protection are not supported.
- The MPLS VPN BGP Local Convergence feature for IPv4 supports the External BGP (eBGP), Routing Information Protocol (RIP), Enhanced Interior Gateway Routing Protocol (EIGRP), Open Shortest Path First (OSPF), and static routing protocols only.
- The MPLS VPN BGP Local Convergence feature for IPv6 supports the eBGP and static routing protocols only.
Information About MPLS VPN BGP Local Convergence
- How Link Failures Are Handled with BGP
- How Links Are Handled with the MPLS VPN BGP Local Convergence Feature
- How Link Failures Are Detected
How Link Failures Are Handled with BGP
Within a Layer 3 Virtual Private Network (VPN) network, the failure of a provider edge (PE)-customer edge (CE) link can cause a loss of connectivity (LoC) to a customer site, which is detrimental to time-sensitive applications. Several factors contribute to the duration of such an outage:
- The time to detect the failure
- The programming of the forwarding
- The convergence of the Border Gateway Protocol (BGP) (in large networks, the restored traffic arrival time at its destination varies according to the prefix)
When BGP detects a PE-CE link failure, it removes all of the BGP paths through the failing link. BGP runs the best-path algorithm on the affected prefixes and selects alternate paths for each prefix. These new paths (which typically include a remote PE) are installed into forwarding. The local labels are removed and BGP withdrawals are sent to all BGP neighbors. As each BGP neighbor receives the withdrawal messages (typically indirectly using route reflectors), the best-path algorithm is called and the prefixes are switched to an alternate path. Only then is connectivity restored.
How Links Are Handled with the MPLS VPN BGP Local Convergence Feature
The MPLS VPN BGP Local Convergence feature requires that the prefixes to be protected on a provider edge (PE)-customer edge (CE) link have at least one backup path that does not include that link. (See the figure below.) The customer site must have backup paths to the provider site.
The MPLS VPN BGP Local Convergence feature reduces loss of connectivity time by sending the broken link’s traffic over a backup path (as shown in the figure below) instead of waiting for total network convergence. The local label is maintained for 5 minutes while prefixes switch from the failing local path to the backup path. Because the label is not freed as had been the usual practice, forwarding continues to take place.
The best-path algorithm selects the backup path. Thus, the local label has been applied in place of the failed Border Gateway Protocol (BGP) best-path label (which is sometimes called “label swapping”). Traffic is restored locally while the network propagation of the BGP withdrawal messages takes place. Eventually, the egress PE device converges and bypasses the local repair.
Note | After the 5-minute label preservation, the local labels are freed. Any BGP prefix that is remote and is not part of a Carrier Supporting Carrier (CSC) network does not have a local label and is removed. The delay in local label deletion does not modify normal BGP addition and deletion of BGP paths. Rather, BGP reprograms the new backup best path into forwarding as usual. |
How Link Failures Are Detected
Local protection relies on the Border Gateway Protocol (BGP) being notified of the interface failure. Detection can occur using either the interface drivers or the routing tables. If an interface or route goes down, the corresponding path in the routing table is removed and BGP will be notified using the routing application programming interfaces (APIs).
However, when the routing table cannot detect the failure (as when a Layer 2 switch goes down), BGP determines that a neighbor is down through use of its hold-down timer. However, that determination can be extremely slow because of the 3-minute default for BGP session timeout.
You can reduce the detection delay by either reducing the BGP session timeout interval (as described in the Configuring Internal BGP Features document) or by enabling the Bidirectional Forwarding Detection (BFD) protocol within External BGP (eBGP) between the provider edge (PE) and customer edge (CE).
How to Configure MPLS VPN BGP Local Convergence
Note | To configure a VPN routing and forwarding (VRF) instance for IPv4 and IPv6 VPNs or to upgrade your existing single-protocol IPv4-only VRF to a multiprotocol VRF configuration, see the “MPLS VPN--VRF CLI for IPv4 and IPv6 VPNs” module. |
- Configuring MPLS VPN BGP Local Convergence with IPv4
- Configuring MPLS VPNBGP Local Convergence with IPv6
- Troubleshooting Tips
Configuring MPLS VPN BGP Local Convergence with IPv4
Ensure that the customer edge (CE) device is already connected to the provider edge (PE) device by a minimum of two paths.
1.
enable
2.
configure terminal
3.
ip vrf
vrf-name
4.
rd
route-distinguisher
5.
protection local-prefixes
6.
do show ip vrf detail
DETAILED STEPS
Configuring MPLS VPNBGP Local Convergence with IPv6
Ensure that the customer edge (CE) device is already connected to the provider edge (PE) device by a minimum of two paths.
1.
enable
2.
configure terminal
3.
vrf definition
vrf-name
4.
rd
route-distinguisher
5.
address-family [ipv4 |
ipv6]
6.
protection local-prefixes
7.
do show ip vrf detail
DETAILED STEPS
Examples
To verify that local link protection has been enabled, enter the show ip vrf detail command. If the protection is enabled, the status message “Local prefix protection enabled” will be shown in the display:
Device# show ip vrf detail
VRF vpn1 (VRF Id = 1); default RD 100:1; default VPNID <not set>
Interfaces:
AT1/0/1.1
VRF Table ID = 1
Export VPN route-target communities
RT:100:1
Import VPN route-target communities
RT:100:1 RT:100:2
No import route-map
No export route-map
VRF label distribution protocol: not configured
VRF label allocation mode: per-prefix
Local prefix protection enabled
Troubleshooting Tips
- Ensure that a minimum of two paths are present for the protected prefix in the Border Gateway Protocol (BGP) in steady state condition on the provider edge (PE) device. The path using the protected PE should be the BGP best-path before failover occurs. To display the configuration, enter the show ip bgp vpnv4 vrf vpn ip-prefix command.
- Ensure that local protection has been enabled in the protected PE by entering the show ip vrf detail command.
- When route reflectors exist in the topology, ensure that each virtual routing and forwarding (VRF) instance has a unique route distinguisher.
Configuration Examples for MPLS VPN BGP Local Convergence
Examples: MPLS VPN BGP Local Convergence
The following examples show how MPLS VPN BGP local convergence can prevent traffic loss after a link failure. You can display a detailed view of local link protection before, during, and after the Border Gateway Protocol (BGP) convergence by using the show bgp vpnv4 and show mpls forwarding-table vrf commands as shown in the following three-stage example.
Note | The show bgp vpnv4 unicast command is equivalent to the show ip bgp vpnv4 command. |
Example 1: Before the Link Failure
Both a primary path and a backup path have been configured:
Device# show bgp vpnv4 unicast all 172.16.0.1
BGP routing table entry for 100:1:172.16.0.1/32, version 2
Paths: (2 available, best #2, table v1)
Flag: 0x820
Advertised to update-groups:
1
100, imported path from 100:2:172.16.0.1/32
172.16.0.6 (metric 21) from 172.16.0.7 (172.16.0.7)
Origin incomplete, metric 0, localpref 100, valid, internal
Extended Community: RT:100:0
Originator: 172.16.0.6, Cluster list: 172.16.0.7
mpls labels in/out 16/17
100
172.16.1.1 from 172.16.1.1 (172.16.0.1)
Origin incomplete, metric 0, localpref 100, valid, external, best
Extended Community: RT:100:0
mpls labels in/out 16/nolabel
BGP routing table entry for 100:2:172.16.0.1/32, version 9
Paths: (1 available, best #1, no table)
Flag: 0x820
Not advertised to any peer
100
172.16.0.6 (metric 21) from 172.16.0.7 (172.16.0.7)
Origin incomplete, metric 0, localpref 100, valid, internal, best
Extended Community: RT:100:0
Originator: 172.16.0.6, Cluster list: 172.16.0.7
mpls labels in/out nolabel/17
Label information for both paths can be displayed:
Device# show bgp vpnv4 unicast all labels
Network Next Hop In label/Out label
Route Distinguisher: 100:1 (v1)
172.16.0.1/32 172.16.0.6 16/17
172.16.1.1 16/nolabel
172.16.0.5/32 172.16.0.4 nolabel/23
172.16.0.22/32 0.0.0.0 17/nolabel(v1)
172.16.0.44/32 172.16.0.4 nolabel/24
172.16.0.66/32 172.16.0.6 nolabel/21
172.16.1.0/24 172.16.1.1 18/nolabel
0.0.0.0 18/nolabel(v1)
172.16.5.0/24 172.16.0.4 nolabel/25
172.16.8.0/24 172.16.0.6 19/23
172.16.1.1 19/nolabel
Route Distinguisher: 100:2
172.16.0.1/32 172.16.0.6 nolabel/17
172.16.0.66/32 172.16.0.6 nolabel/21
172.16.8.0/24 172.16.0.6 nolabel/23
The PE1 (see the first figure above) forwarding table contains BGP best-path information:
Device# show mpls forwarding-table vrf v1 172.16.0.1 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label 172.16.0.1/32[V] 570 Et0/0 172.16.1.1
MAC/Encaps=14/14, MRU=1504, Label Stack{}
AABBCC000B00AABBCC000C000800
VPN route: v1
No output feature configured
Example 2: After the Link Failure and Before BGP Convergence
After the link failure on only one path, the backup path remains available (see the second figure above):
Device# show bgp vpnv4 unicast all 172.16.0.1
BGP routing table entry for 100:1:172.16.0.1/32, version 19
Paths: (1 available, best #1, table v1)
Not advertised to any peer
100, imported path from 100:2:172.16.0.1/32
172.16.0.6 (metric 21) from 172.16.0.7 (172.16.0.7)
Origin incomplete, metric 0, localpref 100, valid, internal, best
Extended Community: RT:100:0
Originator: 172.16.0.6, Cluster list: 172.16.0.7
mpls labels in/out 16/17
BGP routing table entry for 100:2:172.16.0.1/32, version 9
Paths: (1 available, best #1, no table)
Not advertised to any peer
100
172.16.0.6 (metric 21) from 172.16.0.7 (172.16.0.7)
Origin incomplete, metric 0, localpref 100, valid, internal, best
Extended Community: RT:100:0
Originator: 172.16.0.6, Cluster list: 172.16.0.7
mpls labels in/out nolabel/17
The label information for the backup path label can be displayed:
Device# show bgp vpnv4 unicast all labels
Network Next Hop In label/Out label
Route Distinguisher: 100:1 (v1)
172.16.0.1/32 172.16.0.6 16/17
172.16.0.5/32 172.16.0.4 nolabel/23
172.16.0.22/32 0.0.0.0 17/nolabel(v1)
172.16.0.44/32 172.16.0.4 nolabel/24
172.16.0.66/32 172.16.0.6 nolabel/21
172.16.1.0/24 172.16.0.6 nolabel/22
172.16.5.0/24 172.16.0.4 nolabel/25
172.16.8.0/24 172.16.0.6 19/23
Route Distinguisher: 100:2
172.16.0.1/32 172.16.0.6 nolabel/17
172.16.0.66/32 172.16.0.6 nolabel/21
172.16.1.0/24 172.16.0.6 nolabel/22
172.16.8.0/24 172.16.0.6 nolabel/23
The PE 1 (see the first figure above) forwarding table contains new label and next-hop information to direct traffic onto the backup path:
Device# show mpls forwarding-table vrf v1 172.16.0.1 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 17 172.16.0.1/32[V] 0 Et1/0 172.16.3.2
MAC/Encaps=14/22, MRU=1496, Label Stack{21 17}
AABBCC000D00AABBCC000C018847 0001500000011000
VPN route: v1
No output feature configured
Example 3: After Local Label Expiration and BGP Reconvergence
Because the local label preservation window has expired, the replacement local label is now gone from the PE 1 forwarding table information:
Device# show mpls forwarding-table vrf v1 172.16.0.1 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
None 17 172.16.0.1/32[V] 0 Et1/0 172.16.3.2
MAC/Encaps=14/22, MRU=1496, Label Stack{21 17}
AABBCC000D00AABBCC000C018847 0001500000011000
VPN route: v1
No output feature configured
The new BGP information reverts to the configuration shown in the first figure above:
Device# show bgp vpnv4 unicast all 172.16.0.1
BGP routing table entry for 100:1:172.16.0.1/32, version 23
Paths: (1 available, best #1, table v1)
Not advertised to any peer
100, imported path from 100:2:172.16.0.1/32
172.16.0.6 (metric 21) from 172.16.0.7 (172.16.0.7)
Origin incomplete, metric 0, localpref 100, valid, internal, best
Extended Community: RT:100:0
Originator: 172.16.0.6, Cluster list: 172.16.0.7
mpls labels in/out nolabel/17
BGP routing table entry for 100:2:172.16.0.1/32, version 9
Paths: (1 available, best #1, no table)
Not advertised to any peer
100
172.16.0.6 (metric 21) from 172.16.0.7 (172.16.0.7)
Origin incomplete, metric 0, localpref 100, valid, internal, best
Extended Community: RT:100:0
Originator: 172.16.0.6, Cluster list: 172.16.0.7
mpls labels in/out nolabel/17
Device# show bgp vpnv4 unicast all labels
Network Next Hop In label/Out label
Route Distinguisher: 100:1 (v1)
172.16.0.1/32 172.16.0.6 nolabel/17
172.16.0.5/32 172.16.0.4 nolabel/23
172.16.0.22/32 0.0.0.0 17/nolabel(v1)
172.16.0.44/32 172.16.0.4 nolabel/24
172.16.0.66/32 172.16.0.6 nolabel/21
172.16.1.0/24 172.16.0.6 nolabel/22
172.16.5.0/24 172.16.0.4 nolabel/25
172.16.8.0/24 172.16.0.6 nolabel/23
Route Distinguisher: 100:2
172.16.0.1/32 172.16.0.6 nolabel/17
172.16.0.66/32 172.16.0.6 nolabel/21
172.16.1.0/24 172.16.0.6 nolabel/22
172.16.8.0/24 172.16.0.6 nolabel/23
Examples: MPLS VPN BGP Local Convergence for 6VPE 6PE
You can display a detailed view of local link protection before, during, and after the Border Gateway Protocol (BGP) local convergence for Cisco VPN IPv6 provider edge devices (6VPE) and Cisco IPv6 provider edge devices (6PE) over Multiprotocol Label Switching (MPLS) by using the show bgp vpnv6 and show mpls forwarding-table vrf commands as shown in the following three-stage example.
The figure below shows an MPLS VPN with BGP local convergence configured. The PE-to-CE routing protocol is External BGP (eBGP), and the PE to route reflector (RR) sessions are BGP VPNv6. The protected prefix is the CE 1 loopback (2001:0DB8::/128). The primary path is from PE 1 to CE 1. The secondary path is from PE 1, through P and PE3, to CE 1.
Example 1: Before the Link Failure
Both a primary path and a backup path have been configured for the prefix 2001:0DB8::/128. The inlabel/outlabel settings for the two paths are 28/28 and 28/nolabel.
Device# show bgp vpnv6 unicast all 2001:0DB8::/128
BGP routing table entry for [1:1]2001:0DB8::/128, version 5
Paths: (2 available, best #2, table v1)
Advertised to update-groups:
2
100, imported path from [2:2]2001:0DB8::/128
::FFFF:10.6.6.6 (metric 21) from 10.7.7.7 (10.7.7.7)
Origin incomplete, metric 0, localpref 100, valid, internal
Extended Community: RT:1:1
Originator: 10.6.6.6, Cluster list: 10.7.7.7
mpls labels in/out 28/28
100
2001:0DB8:0:ABCD::1 (FE80::A8BB:CCFF:FE00:B00) from 2001:0DB8:0:ABCD::1 (10.1.1.1)
Origin incomplete, metric 0, localpref 100, valid, external, best
Extended Community: RT:1:1
mpls labels in/out 28/nolabel
BGP routing table entry for [2:2]2001:0DB8::/128, version 11
Paths: (1 available, best #1, no table)
Not advertised to any peer
100
::FFFF:10.6.6.6 (metric 21) from 10.7.7.7 (10.7.7.7)
Origin incomplete, metric 0, localpref 100, valid, internal, best
Extended Community: RT:1:1
Originator: 10.6.6.6, Cluster list: 10.7.7.7
mpls labels in/out nolabel/28
The PE 1 forwarding table contains new label and next-hop information to direct traffic onto the backup path:
Device#
show mpls forwarding-table vrf v1 2001:0DB8::/128 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
28 No Label 2001:0DB8::/128[V] 804 Et0/0 FE80::A8BB:CCFF:FE00:B00
MAC/Encaps=14/14, MRU=1504, Label Stack{}
AABBCC000B00AABBCC000C0086DD
VPN route: v1
No output feature configured
Example 2: After the Link Failure
After the link failure, the backup path is still available, the original path is removed from BGP, and the backup path is activated:
Device# show mpls forwarding-table vrf v1 2001:0DB8::/128 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
28 28 2001:0DB8::/128[V] 0 Et1/0 10.3.0.2
MAC/Encaps=14/22, MRU=1496, Label Stack{23 28}
AABBCC000D00AABBCC000C018847 000170000001C000
VPN route: v1
No output feature configured
After a configured length of time, the local label expires. The output from the show mpls forwarding-tablecommand also verifies that the local label has expired:
Device# show mpls forwarding-table vrf v1 2001:0DB8::/128 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
None 28 2001:0DB8::/128[V] 0 Et1/0 10.3.0.2
MAC/Encaps=14/22, MRU=1496, Label Stack{23 28}
AABBCC000D00AABBCC000C018847 000170000001C000
VPN route: v1
No output feature configured
Example 3: After the Link Is Restored
When the link is restored the original path is added to BGP and the traffic switches back to this path:
Device# show bgp vpnv6 unicast all 2001:0DB8::/128
BGP routing table entry for [1:1]2001:0DB8::/128, version 28
Paths: (2 available, best #1, table v1)
Advertised to update-groups:
2
100
2001:0DB8:0:ABCD::1 (FE80::A8BB:CCFF:FE00:B00) from 2001:0DB8:0:ABCD::1 (10.1.1.1)
Origin incomplete, metric 0, localpref 100, valid, external, best
Extended Community: RT:1:1
mpls labels in/out 16/nolabel
100, imported path from [2:2]2001:0DB8::/128
::FFFF:10.6.6.6 (metric 21) from 10.7.7.7 (10.7.7.7)
Origin incomplete, metric 0, localpref 100, valid, internal
Extended Community: RT:1:1
Originator: 10.6.6.6, Cluster list: 10.7.7.7
mpls labels in/out 16/28
BGP routing table entry for [2:2]2001:0DB8::/128, version 11
Paths: (1 available, best #1, no table)
Not advertised to any peer
100
::FFFF:10.6.6.6 (metric 21) from 10.7.7.7 (10.7.7.7)
Origin incomplete, metric 0, localpref 100, valid, internal, best
Extended Community: RT:1:1
Originator: 10.6.6.6, Cluster list: 10.7.7.7
mpls labels in/out nolabel/28
Device# show mpls for vrf v1 2001:0DB8::/128 detail
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or Tunnel Id Switched interface
16 No Label 2001:0DB8::/128[V] 0 Et0/0 FE80::A8BB:CCFF:FE00:B00
MAC/Encaps=14/14, MRU=1504, Label Stack{}
AABBCC000B00AABBCC000C0086DD
VPN route: v1
No output feature configured
Additional References
Related Documents
|
Related Topic |
Document Title |
|---|---|
|
Cisco IOS commands |
|
|
MPLS and MPLS applications commands |
|
|
BGP configuration |
“Configuring a Basic BGP Network” module in the IP Routing: BGP Configuration Guide |
|
Protocol for quickly detecting failed forwarding paths |
“Bidirectional Forwarding Detection” module in the IP Routing: BFD Configuration Guide |
|
Configuration of BGP PIC Edge for IP and MPLS-VPN |
“BGP PIC Edge for IP and MPLS VPN” module in the MPLS Layer 3 VPNs Configuration Guide |
|
Configuration of internal BGP features |
“Configuring Internal BGP Features” module in the IP Routing: BGP Configuration Guide |
|
Configuration of VRF under the specific cases of IPv4 and IPv6 situations |
“MPLS VPN VRF CLI for IPv4 and IPv6 VPNs” module in the MPLS Layer 3 VPNs Configuration Guide |
Standards and RFCs
|
Standard/RFC |
Title |
|---|---|
|
RFC 2547 |
BGP/MPLS VPNs |
Technical Assistance
|
Description |
Link |
|---|---|
|
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Feature Information for MPLS VPN BGP Local Convergence
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
MPLS VPN BGP Local Convergence |
12.2(33)SRC 12.2(33)SB 15.0(1)M Cisco IOS XE Release 3.1S |
The MPLS VPN BGP Local Convergence feature reduces the downtime of a PE-CE link failure by rerouting PE-egress traffic onto a backup path to the CE before BGP has reconverged. In 12.2(33)SRC, this feature was introduced on the Cisco 7200 and the Cisco 7600. In 12.2(33)SB, this feature became available on the Cisco 7300 series and the Cisco 10000 Series Routers. This feature was integrated into Cisco IOS Release 15.0(1)M. In Cisco IOS XE Release 3.1S, this feature was implemented on Cisco ASR 1000 Series Routers. The following command was modified: protection local-prefixes. |
|
MPLS VPN BGP Local Convergence for 6VPE/6PE |
15.0(1)S Cisco IOS XE Release 3.1S |
The MPLS VPN BGP Local Convergence for 6VPE/6PE feature implements MPLS VPN BGP local convergence for Cisco VPN IPv6 provider edge devices (6VPE) and Cisco IPv6 provider edge devices (6PE) over MPLS. In 15.0(1)S, this feature was introduced. In Cisco IOS XE Release, 3.1S, this feature was implemented on Cisco ASR 1000 Series Routers. The following command was modified: protection local-prefixes. |