BGP NSR Support for iBGP Peers
BGP NSR provides BGP nonstop routing (NSR) and nonstop forwarding (NSF) in the event of a switchover from an Active RP to the Standby RP. The BGP NSR Support for iBGP Peers feature provides NSR support for iBGP peers configured under the IPv4 unicast or IPv4 + label address family.
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.
Restrictions on BGP NSR Support for iBGP Peers
This feature applies to iBGP peers configured under IPv4 unicast or IPv4 + label address families.
Information About BGP NSR Support for iBGP Peers
Benefit of BGP NSR Support for iBGP Peers
Nonstop routing is beneficial for iBGP peers because it reduces the likelihood of dropped packets during switchover from the Active RP to the Standby RP. Switchover occurs when the Active RP fails for some reason, and the Standby RP takes control of Active RP operations.
How to Configure BGP NSR Support for iBGP Peers
Making an iBGP Peer NSR-Capable for the IPv4 Address Family
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
autonomous-system-number
4.
address-family
ipv4
[unicast |
vrf
vrf-name]
5.
neighbor
ip-address
remote-as
as-number
6.
neighbor
ip-address
activate
7.
neighbor
ip-address
ha-mode sso
8.
end
DETAILED STEPS| | Command or Action | Purpose |
|---|
| Step 1 |
enable
Example:
|
Enables privileged EXEC mode.
|
| Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global configuration mode.
|
| Step 3 |
router
bgp
autonomous-system-number
Example:
Device(config)# router bgp 4000
|
Enters router configuration mode for the specified routing process.
|
| Step 4 |
address-family
ipv4
[unicast |
vrf
vrf-name]
Example:
Device(config-router)# address-family ipv4 unicast
|
Specifies the IPv4 address family and enters address family configuration mode.
The
unicast keyword specifies the IPv4 unicast address family.
The
vrf keyword and
vrf-name argument specify the name of the virtual routing and forwarding (VRF) instance to associate with subsequent IPv4 address family configuration mode commands.
|
| Step 5 |
neighbor
ip-address
remote-as
as-number
Example:
Device(config-router-af)# neighbor 192.168.1.1 remote-as 4000
|
Specifies the autonomous system of the neighbor.
|
| Step 6 |
neighbor
ip-address
activate
Example:
Device(config-router-af)# neighbor 192.168.1.1 activate
|
Activates the specified peer.
|
| Step 7 |
neighbor
ip-address
ha-mode sso
Example:
Device(config-router-af)# neighbor 192.168.1.1 ha-mode sso
|
Configures a BGP neighbor to support BGP NSR with stateful switchover (SSO).
|
| Step 8 |
end
Example:
Device(config-router-af)# end
|
Exits address family configuration mode and returns to privileged EXEC mode.
|
Making an iBGP Peer NSR-Capable for the VPNv4 Address Family
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
autonomous-system-number
4.
neighbor
ip-address
remote-as
as-number
5.
neighbor
ip-address
ha-mode sso
6.
address-family
vpnv4
[unicast]
7.
neighbor
ip-address
activate
8.
end
DETAILED STEPS| | Command or Action | Purpose |
|---|
| Step 1 |
enable
Example:
|
Enables privileged EXEC mode.
|
| Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global configuration mode.
|
| Step 3 |
router
bgp
autonomous-system-number
Example:
Device(config)# router bgp 4000
|
Enters router configuration mode for the specified routing process.
|
| Step 4 |
neighbor
ip-address
remote-as
as-number
Example:
Device(config-router)# neighbor 192.168.1.1 remote-as 4000
|
Specifies the autonomous system of the neighbor.
|
| Step 5 |
neighbor
ip-address
ha-mode sso
Example:
Device(config-router)# neighbor 192.168.1.1 ha-mode sso
|
Configures a BGP neighbor to support BGP NSR with stateful switchover (SSO).
|
| Step 6 |
address-family
vpnv4
[unicast]
Example:
Device(config-router)# address-family VPNv4 unicast
|
Specifies the VPNv4 address family and enters address family configuration mode.
|
| Step 7 |
neighbor
ip-address
activate
Example:
Device(config-router-af)# neighbor 192.168.1.1 activate
|
Activates the specified peer.
|
| Step 8 |
end
Example:
Device(config-router-af)# end
|
Exits address family configuration mode and returns to privileged EXEC mode.
|
Making an iBGP Peer NSR Capable at the Router Level
SUMMARY STEPS1.
enable
2.
configure
terminal
3.
router
bgp
autonomous-system-number
4.
neighbor
ip-address
remote-as
as-number
5.
neighbor
ip-address
activate
6.
neighbor
ip-address
ha-mode sso
7.
end
8.
show
ip
bgp
sso
summary
DETAILED STEPS| | Command or Action | Purpose |
|---|
| Step 1 |
enable
Example:
|
Enables privileged EXEC mode.
|
| Step 2 |
configure
terminal
Example:
Device# configure terminal
|
Enters global configuration mode.
|
| Step 3 |
router
bgp
autonomous-system-number
Example:
Device(config)# router bgp 4000
|
Enters router configuration mode for the specified routing process.
|
| Step 4 |
neighbor
ip-address
remote-as
as-number
Example:
Device(config-router)# neighbor 192.168.1.1 remote-as 4000
|
Specifies the autonomous system of the neighbor.
|
| Step 5 |
neighbor
ip-address
activate
Example:
Device(config-router)# neighbor 192.168.1.1 activate
|
Activates the specified neighbor.
|
| Step 6 |
neighbor
ip-address
ha-mode sso
Example:
Device(config-router)# neighbor 192.168.1.1 ha-mode sso
|
Configures the specified peer to be NSR capable in all of the NSR-supported address families under which that peer has been activated.
|
| Step 7 |
end
Example:
Device(config-router)# end
|
Exits configuration mode and returns to privileged EXEC mode.
|
| Step 8 | show
ip
bgp
sso
summary
Example:
Device# show ip bgp sso summary
|
(Optional) Displays information about stateful switchover (sso) and whether a peer has NSR enabled or disabled.
|
Configuration Examples for BGP NSR Support for an iBGP Peer
Example: Configuring an iBGP Peer To Be NSR Capable
Configuring an iBGP Peer to Be NSR Capable at the Address Family Level
router bgp 4000
address-family ipv4 unicast
neighbor 192.168.1.1 remote-as 4000
neighbor 192.168.1.1 activate
neighbor 192.168.1.1 ha-mode sso
Configuring an iBGP Peer to Be NSR Capable at the Router Level
router bgp 4000
neighbor 192.168.1.1 remote-as 4000
neighbor 192.168.1.1 activate
neighbor 192.168.1.1 ha-mode sso
Additional References
Technical Assistance
Description
|
Link
|
|---|
|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.
|
http://www.cisco.com/cisco/web/support/index.html
|
Feature Information for BGP NSR Support for iBGP Peers
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.
Table 1 Feature Information for BGP NSR Support for iBGP PeersFeature Name
|
Releases
|
Feature Information
|
|---|
|
BGP NSR Support for iBGP Peers
|
15.2(2)S
|
BGP NSR provides BGP nonstop routing and nonstop forwarding in the event of a switchover from an active RP to the standby RP.
The following commands were modified:
neighbor ha-mode sso and
show ip bgp vpnv4 all sso summary.
|
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