Configuring Bgp Fast Fall-Over - Dell S6100 Configuration Manual

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BGP version 4

Minimum time between advertisement runs is 5 seconds

For address family: IPv4 Unicast

BGP neighbor is zanzibar, peer-group internal,

Number of peers in this group 26

Peer-group members (* - outbound optimized):

Configuring BGP Fast Fall-Over

By default, a BGP session is governed by the hold time.

BGP routers typically carry large routing tables, so frequent session resets are not desirable. The BGP fast fall-over feature reduces the

convergence time while maintaining stability. The connection to a BGP peer is immediately reset if a link to a directly connected external

When you enable fall-over, BGP tracks IP reachability to the peer remote address and the peer local address. Whenever either address

becomes unreachable (for example, no active route exists in the routing table for peer IPv6 destinations/local address), BGP brings down

the session with the peer.

The BGP fast fall-over feature is configured on a per-neighbor or peer-group basis and is disabled by default.

To enable the BGP fast fall-over feature, use the following command.

To disable fast fall-over, use the [no] neighbor [neighbor | peer-group] fall-over command in CONFIGURATION

ROUTER BGP mode.

Enable BGP Fast fall-Over.

CONFIG-ROUTER-BGP mode

neighbor {ip-address | peer-group-name} fall-over

Examples of Verifying that Fast fall-Over is Enabled on a BGP Neighbor and a Peer-Group

To verify that you enabled fast fall-over on a particular BGP neighbor, use the show ip bgp neighbors command. Because fast fall-

over is disabled by default, it appears only if it has been enabled (shown in bold).

Dell#sh ip bgp neighbors

Border Gateway Protocol IPv4 (BGPv4)