HP 4500G PWR 24-Port, Руководство по настройке

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The current BGP implementation supports the route-refresh capability, with which, a router can
dynamically refresh its BGP routing table when the route selection policy is modified, without tearing
down BGP connections. If a BGP peer does not support route-refresh, you need to save updates from
the peer on the local router. After that, when a route selection policy is modified, the router can refresh
its BGP routing table by using such updates without tearing down BGP connections.
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:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter BGP view
bgp as-number
—
Enable BGP route refresh for a
peer/peer group
peer
{
group-name
|
ip-address
}
capability-advertise
route-refresh
Optional
Enabled by default
Configure manual soft-reset
If a BGP peer does not support route-refresh, you need to save updates from the peer on the local
router by using the
peer keep-all-routes
command. When a route selection policy is modified, you can
use the
refresh bgp
command to refresh the BGP routing table by applying the new policy.
Following these steps to save all route updates from a peer/peer group:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter BGP view
bgp as-number
—
Disable BGP route-refresh and
multi-protocol extension capability for a
peer/peer group
peer
{
group-name
|
ip-address
}
capability-advertise
conventional
Optional
Enabled by default
Save all routes from a peer/peer group
peer
{
group-name
|
ip-address
}
keep-all-routes
Optional
Not saved by default
Return to user view
return
—
Perform manual soft reset on BGP
connections
refresh bgp
{
all
|
ip-address
|
group group-name
|
external
|
internal
} {
export
|
import
}
Required
Enabling Quick eBGP Session Reestablishment
If the router receives no keepalive messages from a BGP peer within the holdtime, it tears down the
connection to the peer.