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When Bidirectional Forwarding Detection (BFD) support is configured with Intermediate System To Intermediate System (IS-IS) as a registered protocol with BFD, IS-IS receives forwarding path detection failure messages from BFD.
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IS-IS must be running on all participating devices.
The baseline parameters for BFD sessions must be configured on the interfaces that run BFD sessions to BFD neighbors.
When BFD support is configured with IS-IS as a registered protocol with BFD, IS-IS receives forwarding path detection failure messages from BFD. BFD support for IS-IS can be configured in either router address-family configuration mode or interface configuration mode. IS-IS IPv6 can run in single-topology or in Multi-Topology (MT) mode.
IS-IS BFD supports both IPv4 and IPv6 on the same adjacency for single-topology or multi-topology mode. If BFD is enabled for both IPv4 and IPv6, IS-IS sends two BFD session creation requests to BFD. For single-topology mode, the IS-IS adjacency state can only be UP if both BFD sessions are UP. If either of the BFD sessions is DOWN, the associated IS-IS adjacency state is also DOWN. For MT mode, the IS-IS adjacency state can be UP as long as one of topologies has a BFD session in an UP state.
An IS-IS adjacency entry exists.
The Address Family Identifier (AFI) specific peer interface address is known.
IS-IS BFD is enabled for that AFI on an interface.
IS-IS is enabled for that AFI on the local interface.
If the neighboring device supports RFC 6213, BFD must be enabled for the specified Multi-Topology Identifier (MTID) or Network Layer Protocol Identifier (NLPID).
The IS-IS instance is deleted or un-configured.
The IS-IS adjacency entry is deleted.
IS-IS BFD is disabled on the next hop interface for an address-family.
The neighboring device supports RFC 6213 and indicates that it no longer supports BFD for the specified MTID or NLPID.
1.
enable
2.
configure
terminal
3.
interface
type
number
4.
isis
ipv6
bfd
5.
end
1.
enable
2.
configure
terminal
3.
router
isis
4.
metric-style wide
5.
address-family
ipv6
6.
multi-topology
7.
bfd all-interfaces
8.
end
Device> enable Device# configure terminal Device(config)# interface gigabitethernet 6/0/0 Device(config-if)# isis ipv6 bfd Device(config-if)# end
Device> enable Device# configure terminal Device(config)# interface gigabitethernet 6/0 Device(config-if)# isis ipv6 bfd Device(config-if)# end
Device> enable Device# configure terminal Device(config)# router isis Device(config-router)# metric-style wide Device(config-router)# address-family ipv6 Device(config-router-af)# multi-topology Device(config-router-af)# bfd all-interfaces Device(config-router-af)# end
Related Topic |
Document Title |
---|---|
Cisco IOS commands |
Cisco IOS Master Command List, All Releases |
BFD commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples. |
Cisco IOS IP Routing: Protocol-Independent Command Reference |
Configuring and monitoring IS-IS |
“Configuring Integrated IS-IS” module of the IP Routing Protocols Configuration Guide |
Cisco IOS IPv6 features |
Cisco IOS IPv6 Feature Mapping |
IPv6 commands |
Cisco IOS IPv6 Command Reference |
Description |
Link |
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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 . An account on Cisco.com is not required.Feature Name |
Releases |
Feature Information |
---|---|---|
IS-IS IPv6 Client for BFD |
15.1(1)SY 15.2(4)S 15.3(1)T |
When BFD support is configured with IS-IS as a registered protocol with BFD, IS-IS receives forwarding path detection failure messages from BFD. The following commands were introduced or modified: bfd all-interfaces, isis ipv6 bfd. |