Configuring BGP4+ Graceful Restart per Neighbor

Note

High availability (HA) requires GR to be enabled.

Enter the configure terminal command to access global configuration mode.
```
SLX # configure terminal
```
Enter the router bgp command to enable BGP routing.
```
SLX (config)# router bgp 
```
Enter the local-as command to configure the autonomous system number (ASN) in which your device resides.
```
SLX (config-bgp-router)# local-as 1000
```

Enable Graceful Restart for the IPv6 neighbor.

SLX (config-bgp-router)# neighbor 1000::1 graceful-restart

Enter the address-family ipv6 unicast command to enter IPv6 address-family configuration mode.
```
SLX (config-bgp-router)# address-family ipv6 unicast
```

Activate the IPv6 neighbor.

SLX (config-bgp-ipv6u)# neighbor 1000::1 activate

Do any of the following additional configurations:
- Enter the graceful-restart command and use purge-time parameter to overwrite the default purge-time value.
```
SLX (config-bgp-ipv6u)# graceful-restart purge-time 300
```
- Enter the graceful-restart command and use restart-time parameter to overwrite the default restart-time advertised to graceful restart-capable neighbors.
```
device(config-bgp-ipv6u)# graceful-restart restart-time 180
```
- Enter the graceful-restart command and use stale-routes-time parameter to overwrite the default amount of time that a helper device will wait for an EOR message from a peer.
```
device(config-bgp-ipv6u)# graceful-restart stale-routes-time 100 
```

The following example enables the GR feature.

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 1
device(config-bgp-router)# neighbor 1000::1 remote-as 2
device(config-bgp-router)# neighbor 1000::1 graceful-restart
device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)# neighbor 1000::1 activate

Use the clear ipv6 bgp neighbor command with the all parameter for the changes to the GR parameters to take effect immediately.