F3215-HP Load Balancing Module Network Management Configuration Guide-6PW101

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For this example, if synchronization is enabled, and the route 8.0.0.0/24 received from Router B is
available in its IGP routing table, Router D advertises the IBGP route when the following conditions are
satisfied:
• The next hop of the route is reachable.
• An active route with the same destination network segment is available in the IGP routing table (use
the display ip routing-table protocol command to check the IGP route state).
You can disable the synchronization feature in the following situations:
• The local AS is not a transitive AS (AS 20 is a transitive AS in the above figure).
• Routers in the local AS are IBGP fully meshed.
To enable BGP and IGP synchronization:
Ste
p
Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Enable synchronization
between BGP and IGP.
synchronization Not enabled by default.
Limiting prefixes received from a peer or peer group
This feature can prevent that send a large number of BGP routes to the router.
If the number of routes received from a peer or peer group exceeds the upper limit, the router takes one
of the following actions based on your configuration:
• Tear down the BGP session to the peer or peer group.
• Display an alarm message.
• Tear down the BGP session to the peer or peer group and, after a specified period of time,
reestablishes a BGP session to the peer or peer group.
You can specify the threshold value for the router to display an alarm message. When the ratio of the
number of received routes to the maximum number reaches the percentage value, the router displays an
alarm message.
To configure the maximum number of prefixes allowed to be received from a peer or peer group:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view. bgp as-number N/A
3. Specify the maximum number
of routes that a router can
receive from a peer or peer
group.
peer { group-name | ip-address }
route-limit prefix-number
[ { alert-only | reconnect
reconnect-time } |
percentage-value ] *
By default, the number of routes
that a router can receive from a
peer or peer group is not limited.
Configuring BGP route dampening
By configuring BGP route dampening, you can suppress unstable routes from being added to the local
routing table or from being advertised to BGP peers.
To configure BGP route dampening: