Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

Enabling or disabling BGP neighbors

You can enable or disable all the configured BGP neighbors using the shutdown all command in ROUTER BGP mode.

To disable all the configured BGP neighbors:

1. Enter the router bgp mode using the following command:

   CONFIGURATION Mode

   router bgp as-number

2. In ROUTER BGP mode, enter the following command:

   ROUTER BGP Mode

   shutdown all

   You can use the no shutdown all command in the ROUTER BGP mode to re-enable all the BGP interface.

You can also enable or disable BGP neighbors corresponding to the IPv4 unicast or multicast address families and the IPv6 unicast address family.

To enable or disable BGP neighbors corresponding to the IPv4 unicast address families, use the following commands:

1. Enter the router bgp mode using the following command:

   CONFIGURATION Mode

   router bgp as-number

2. Shut down the BGP neighbors corresponding to the IPv4 unicast address family using the following command:

   shutdown address-family-ipv4-unicast

To enable or disable BGP neighbors corresponding to IPv4 multicast address family:

1. Enter the router bgp mode using the following command:

   CONFIGURATION Mode

   router bgp as-number

2. Shut down the BGP neighbors corresponding to IPv4 multicast address family using the following command:

   ROUTER-BGP Mode

   shutdown address-family-ipv4-multicast

To enable or disable BGP neighbors corresponding to the IPv6 unicast address family:

1. Enter the router bgp mode using the following command:

   CONFIGURATION Mode

   router bgp as-number

2. Shut down the BGP neighbors corresponding to the IPv6 unicast address family using the following command:

   ROUTER-BGP Mode

   shutdown address-family-ipv6-unicast

When you configure BGP, you must explicitly enable the BGP neighbors using the following commands:

neighbor {ip-address | peer-group name} remote-as as-number
neighbor {ip-address | peer-group-name} no shutdown

For more information on enabling BGP, see Enabling BGP.

When you use the shutdown all command in global configuration mode, this command takes precedence over the shutdown address-family-ipv4-unicast, shutdown address-family-ipv4-multicast, and shutdown address-family-ipv6-unicast commands. Irrespective of whether the BGP neighbors are disabled earlier, the shutdown all command brings down all the configured BGP neighbors.

When you issue the no shutdown all command, all the BGP neighbor neighbors are enabled. However, when you re-enable all the BGP neighbors in global configuration mode, only the neighbors that were not in disabled state before the global shutdown come up.

Meaning, BGP neighbors corresponding to the IPv4 unicast or multicast address family and the IPv6 unicast address family that were explicitly disabled before the global shutdown remains in disabled state. Use the no shutdown address-family-ipv4-unicast, no shutdown address-family-ipv4-multicast, or no shutdown address-family-ipv6-unicast commands to enable these neighbors.