Configuring The Med Attribute; Configuring The As_Path Attribute; Adjusting And Optimizing Ipv6 Bgp Networks - 3Com MSR 50 Series Configuration Manual

1024 C 62: IP 6 BGP C
HAPTER V
Configuring the MED
Attribute
Configuring the
AS_PATH Attribute
Adjusting and
Optimizing IPv6 BGP
Networks
ONFIGURATION
for routes to the EBGP peer by default, unless the peer next-hop-local
command is configured.
Follow these steps to configure the MED attribute:
To do...
Enter system view
Enter BGP view
Enter IPv6 address family view ipv6-family
Configure a default MED
value
Enable to compare MED
values of routes from different
EBGP peers
Prioritize MED values of routes
from each AS
Prioritize MED values of routes
from confederation peers
Follow these steps to configure the AS_PATH attribute:
To do...
Enter system view
Enter BGP view
Enter IPv6 address family view ipv6-family
Allow the local AS number to
appear in AS_PATH of routes
from a peer/peer group and
specify the repeat times
Specify a fake AS number for
a peer/peer group
Neglect the AS_PATH
attribute for best route
selection
Configure to carry only the
public AS number in updates
sent to a peer/peer group
Substitute local AS number
for the AS number of a
peer/peer group indicated in
the AS_PATH attribute
This section describes configurations of IPv6 BGP timers, IPv6 BGP connection soft
reset and the maximum number of load balanced routes.
IPv6 BGP timers
■
Use the command...
system-view
bgp as-number
default med med-value
compare-different-as-med
bestroute compare-med
bestroute
med-confederation
Use the command...
system-view
bgp as-number
peer { ipv6-group-name |
ipv6-address } allow-as-loop
[ number ]
peer { ipv6-group-name |
ipv6-address } fake-as
as-number
bestroute as-path-neglect
peer { ipv6-group-name |
ipv6-address } public-as-only
peer { ipv6-group-name |
ipv6-address } substitute-as
Remarks
-
Required
-
Optional
Defaults to 0
Optional
Not enabled by default
Optional
Not configured by default
Optional
Not configured by default
Remarks
-
Required
-
Optional
Not allowed by default
Optional
Not specified by default
Optional
Not neglected by default
Optional
By default, BGP updates carry
private AS number
Optional
Not substituted by default