Setting a Specified Peer or Each Peer in a Peer Group as an Independent Update Peer-Group
Setting a specified peer or each peer in a peer group as an independent update peer-group prevents routes learned from the peer from being sent back to the peer.
Usage Scenario
To improve the efficiency of route advertisement, BGP uses the dynamic update peer-group mechanism. The BGP peers with the same configurations are placed in an update peer-group. These routes are grouped once and then sent to all peers in the update peer-group. However, the routes learned from a peer may be sent back to the peer, for example, the preferred route learned from an EBGP peer is sent back to the EBGP peer, or the preferred route that an RR learns from a client is reflected back to the client. In this case, messages are discarded, wasting network resources.
To address this problem, you can set a specified peer or each peer in a peer group as an independent update peer-group so that the routes learned from the peer are not sent back to the peer.
Setting a specified peer or each peer in a peer group as an independent update peer-group can be performed in multiple address families. This section uses the BGP-IPv4 unicast address family as an example. For details about the address families supported, see peer update-group-independent.
Pre-configuration Tasks
Before setting a specified peer or each peer in a peer group as an independent update peer-group, configure basic BGP functions.
Procedure
- Run system-view
The system view is displayed.
- Run bgp { as-number-plain | as-number-dot }
The BGP view is displayed.
- Run ipv4-family unicast
The IPv4 unicast address family view is displayed.
- Set a specified peer or each peer in a peer group as an independent update peer-group.
The configuration of a peer takes precedence over that of the peer group to which the peer belongs.
- Run commit
The configuration is committed.
Checking the Configurations
After setting a specified peer or each peer in a peer group as an independent update peer-group, check the configurations.
Run the display bgp update-peer-group command to check information about update peer-groups.