- Cisco BGP Overview
- BGP 4
- Configuring a Basic BGP Network
- BGP Support for 4-byte ASN
- IPv6 Routing: Multiprotocol BGP Extensions for IPv6
- IPv6 Routing: Multiprotocol BGP Link-Local Address Peering
- IPv6 Multicast Address Family Support for Multiprotocol BGP
- Connecting to a Service Provider Using External BGP
- BGP Named Community Lists
- BGP Prefix-Based Outbound Route Filtering
- BGP Route-Map Continue Support for Outbound Policy
- Removing Private AS Numbers from the AS Path in BGP
- Configuring BGP Neighbor Session Options
- BGP Neighbor Policy
- BGP Dynamic Neighbors
- BGP Support for Next-Hop Address Tracking
- BGP Restart Neighbor Session After Max-Prefix Limit Reached
- BGP Support for Dual AS Configuration for Network AS Migrations
- Configuring Internal BGP Features
- BGP VPLS Auto Discovery Support on Route Reflector
- BGP NSF Awareness
- IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
- BGP Support for BFD
- BGP Support for MTR
- BGP Link Bandwidth
- iBGP Multipath Load Sharing
- BGP Multipath Load Sharing for Both eBGP and iBGP in an MPLS-VPN
- Loadsharing IP Packets Over More Than Six Parallel Paths
- BGP Policy Accounting
- BGP Policy Accounting Output Interface Accounting
- BGP Cost Community
- BGP Support for IP Prefix Import from Global Table into a VRF Table
- BGP Support for IP Prefix Export from a VRF Table into the Global Table
- BGP per Neighbor SoO Configuration
- Per-VRF Assignment of BGP Router ID
- BGP Next Hop Unchanged
- BGP Event-Based VPN Import
- BGP Best External
- BGP PIC Edge for IP and MPLS-VPN
- Configuring BGP: RT Constrained Route Distribution
- Configuring BGP Consistency Checker
- BGP MIB Support
- Cisco-BGP-MIBv2
- BGP Additional Paths
- BGP Attribute Filter and Enhanced Attribute Error Handling
- BGP—Support for iBGP Local-AS
- BGP-Multiple Cluster IDs
- BGP-RT and VPN Distinguisher Attribute Rewrite Wildcard
- BGP-VPN Distinguisher Attribute
- BGP-VRF-Aware Conditional Advertisement
- BGP Diverse Path Using a Diverse-Path Route Reflector
- BGP Graceful Shutdown
Contents
- IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
- Finding Feature Information
- Information About IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
- Nonstop Forwarding and Graceful Restart for MP-BGP IPv6 Address Family
- How to Configure IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
- Configuring the IPv6 BGP Graceful Restart Capability
- Configuration Examples for IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
- Example: Configuring the IPv6 BGP Graceful Restart Capability
- Additional References
- Feature Information for IPv6: NSF and Graceful Restart for MP-BGP IPv6 Address Family
IPv6 NSF and Graceful Restart for MP-BGP IPv6 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.
Information About IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
Nonstop Forwarding and Graceful Restart for MP-BGP IPv6 Address Family
The graceful restart capability is supported for IPv6 BGP unicast, multicast, and VPNv6 address families, enabling Cisco nonstop forwarding (NSF) functionality for BGP IPv6. The BGP graceful restart capability allows the BGP routing table to be recovered from peers without keeping the TCP state.
NSF continues forwarding packets while routing protocols converge, therefore avoiding a route flap on switchover. Forwarding is maintained by synchronizing the FIB between the active and standby RP. On switchover, forwarding is maintained using the FIB. The RIB is not kept synchronized; therefore, the RIB is empty on switchover. The RIB is repopulated by the routing protocols and subsequently informs FIB about RIB convergence by using the NSF_RIB_CONVERGED registry call. The FIB tables are updated from the RIB, removing any stale entries. The RIB starts a failsafe timer during RP switchover, in case the routing protocols fail to notify the RIB of convergence.
The Cisco BGP address family identifier (AFI) model is designed to be modular and scalable, and to support multiple AFI and subsequent address family identifier (SAFI) configurations.
How to Configure IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
Configuring the IPv6 BGP Graceful Restart Capability
1.
enable
2.
configure
terminal
3.
router
bgp
as-number
4.
address-family
ipv6
[
vrf
vrf-name
] [unicast |
multicast |
vpnv6]
5.
bgp
graceful-restart
[restart-time
seconds |
stalepath-time
seconds] [all]
DETAILED STEPS
Configuration Examples for IPv6 NSF and Graceful Restart for MP-BGP IPv6 Address Family
Example: Configuring the IPv6 BGP Graceful Restart Capability
In the following example, the BGP graceful restart capability is enabled:
Device# configure terminal Device(config)# router bgp 65000 Device(config-router)# address-family ipv6 Device(config-router-af)# bgp graceful-restart
In the following example, the restart timer is set to 130 seconds:
Device# configure terminal Device(config)# router bgp 65000 Device(config-router)# address-family ipv6 Device(config-router-af)# bgp graceful-restart restart-time 130
In the following example, the stalepath timer is set to 350 seconds:
Device# configure terminal Device(config)# router bgp 65000 Device(config-router)# address-family ipv6 Device(config-router-af)# bgp graceful-restart stalepath-time 350
Additional References
Related Documents
Related Topic |
Document Title |
|---|---|
|
IPv6 addressing and connectivity |
IPv6 Configuration Guide |
|
Cisco IOS commands |
|
|
IPv6 commands |
|
|
Cisco IOS IPv6 features |
Standards and RFCs
Standard/RFC |
Title |
|---|---|
|
RFCs for IPv6 |
MIBs
|
MIB |
MIBs Link |
|---|---|
|
— |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
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. |
Feature Information for IPv6: NSF and Graceful Restart for MP-BGP IPv6 Address Family
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 |
|---|---|---|
|
IPv6: NSF and Graceful Restart for MP-BGP IPv6 Address Family |
12.2(33)SRE 15.0(1)SY 15.0(1)S 15.2(2)S |
The graceful restart capability is supported for IPv6 BGP unicast, multicast, and VPNv6 address families, enabling Cisco NSF functionality for BGP IPv6. The BGP graceful restart capability allows the BGP routing table to be recovered from peers without keeping the TCP state. No commands were introduced or modified. |