Tuning And Optimizing Ipv6 Bgp Networks; Configuration Prerequisites; Configuring Ipv6 Bgp Timers - HPE 5800 Series Configuration Manual

Tuning and optimizing IPv6 BGP networks

This section describes configurations of IPv6 BGP timers, IPv6 BGP connection soft reset, and the
maximum number of load balanced routes.
•
IPv6 BGP timers
After establishing an IPv6 BGP connection, two routers send keepalive messages periodically
to each other to maintain the connection. If a router receives no keepalive message from the
peer after the holdtime elapses, it tears down the connection.
When establishing an IPv6 BGP connection, the two parties compare their holdtimes, taking the
shorter one as the common holdtime. If the holdtime is 0, keepalive message is not sent, nor is
holdtime checked.
•
IPv6 BGP connection soft reset
After modifying a route selection policy, reset IPv6 BGP connections to make the new one take
effect. IPv6 BGP supports the route-refresh feature that enables dynamic route refresh without
needing to disconnect IPv6 BGP links.
After this feature is enabled on all IPv6 BGP routers, a router that wants to apply a new route
selection policy advertises a route-refresh message to its peers, which then send their routing
information to the router. After receiving the routing information, the router can perform dynamic
route update by using the new policy without tearing down connections.
If a peer not supporting route-refresh exists in the network, configure the peer keep-all-routes
command to save all routes from the peer. When the routing policy is changed, the system
updates the IPv6 BGP routing table and applies the new policy.

Configuration prerequisites

Before you configure IPv6 BGP timers, complete the following tasks:
•
Enable IPv6.
•
Configure IPv6 BGP basic functions.

Configuring IPv6 BGP timers

Step
Enter system view.
1.
Enter BGP view.
2.
Enter IPv6 address family
3.
view.
Configure IPv6 BGP timers.
4.
Command
system-view
bgp as-number
ipv6-family
•
Specify keepalive interval and
holdtime:
timer keepalive keepalive hold
holdtime
•
Configure keepalive interval and
holdtime for an IPv6 peer or peer
group:
peer { ipv6-group-name |
ipv6-address } timer keepalive
keepalive hold holdtime
327
Remarks
N/A
N/A
N/A
Optional.
The keepalive interval
defaults to 60 seconds,
holdtime defaults to 180
seconds.
The holdtime interval must
be at least three times the
keepalive interval.