H3C Technologies H3C S7500E Series Switches - Manual (Page 238)

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z The maximum keepalive interval should be one third of the holdtime and no less than 1 second.
The holdtime is no less than 3 seconds unless it is set to 0.
z The intervals set with the peer timer command are preferred to those set with the timer
command.
z If the router has established a neighbor relationship with a peer, you need to reset the BGP
connection to validate the new set timers.
Configuring the Interval for Sending the Same Update
Follow these steps to configure the interval for sending the same update to a peer/peer group:
To do… Use the command… Remarks
Enter system view system-view —
Enter BGP view bgp as-number —
Configure the interval for sending the same
update to a peer/peer group
peer { group-name |
ip-address }
route-update-interval interval
Optional
The intervals for sending the
same update to an iBGP
peer and an eBGP peer
default to 15 seconds and
30 seconds respectively.
Configuring BGP Soft-Reset
After modifying a route selection policy, you have to reset BGP connections to make the new one take
effect, causing short time disconnection.
The current BGP implementation supports the route-refresh feature that enables dynamic route refresh
without tearing down BGP connections.
However, if a peer not supporting route-refresh exists in the network, you need to configure the peer
keep-all-routes command to save all routes from the peer. When the routing policy is changed, the
system will update the BGP routing table and apply the new policy.
Configure automatic soft-reset
After route refresh is enabled for peers and then a policy is modified, the router advertises a
route-refresh message to the peers, which then resend their routing information to the router. In this
way, the router can perform dynamic route update and apply the new policy without tearing down BGP
connections.
Follow these steps to enable BGP route refresh for a peer/peer group: