Confederation Id - H3C MSR 20-20 Command Reference Manual

958 C 72: BGP C
HAPTER
Description
Examples

confederation id

Syntax
View
Parameters
Description
C
ONFIGURATION OMMANDS
Use the compare-different-as-med
MED for paths from peers in different ASs.
Use the
undo compare-different-as-med
comparison.
The comparison is disabled by default.
If there are several paths for one destination available, the path with the smallest
MED is selected.
Do not use this command unless associated ASs adopt the same IGP protocol and
routing selection method.
# In BGP view, enable to compare the MED for paths from peers in different ASs.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] compare-different-as-med
# In BGP-VPN instance view, enable to compare the MED for paths from peers in
different ASs (The VPN has been created).
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family vpn-instance vpn1
[Sysname-bgp-vpn1] compare-different-as-med
confederation id as-number
undo confederation id
BGP view
as-number: Number of the AS that contains multiple sub-ASs, in the range 1 to
65535.
Use the
confederation id
Use the
undo confederation id
By default, no confederation ID is configured.
Configuring a confederation can reduce IBGP connections in a large AS. You can
split the AS into several sub-ASs, and each sub-AS remains fully meshed. These
sub-ASs form a confederation. Key IGP attributes of a route, such as the next hop,
MED, local preference, are not discarded when crossing each sub-AS. The sub-ASs
still look like a whole from the perspective of other ASs. This can ensure the
integrity of the former AS, and solve the problem of too many IBGP connections in
the AS.
command to enable the comparison of the
command to disable the
command to configure a confederation ID.
command to remove a specified confederation.