Configuring Ipv6 Bgp Route Attributes; Prerequisites; Configuring Ipv6 Bgp Preference And Default Local_Pref And Next_Hop Attributes - 3Com MSR 50 Series Configuration Manual

Configuring IPv6 BGP
Route Attributes

Prerequisites

Configuring IPv6 BGP
Preference and Default
LOCAL_PREF and
NEXT_HOP Attributes
To do...
Configure IPv6 BGP route
dampening parameters
This section describes how to use IPv6 BGP route attributes to modify BGP routing
policy. These attributes are:
IPv6 BGP protocol preference
■
Default LOCAL_PREF attribute
■
MED attribute
■
NEXT_HOP attribute
■
AS_PATH attribute
■
Before configuring this task, you have:
Enabled IPv6 function
■
Configured IPv6 BGP basic functions
■
Follow these steps to configure IPv6 BGP preference and default LOCAL_PREF and
NEXT_HOP attributes:
To do...
Enter system view
Enter BGP view
Enter IPv6 address family view ipv6-family
Configure preference values
for IPv6 BGP external, internal,
local routes
Configure the default value
for local preference
Advertise routes to a
peer/peer group with the local
router as the next hop
n
To make sure an IBGP peer can find the correct next hop, you can configure
■
routes advertised to the peer to use the local router as the next hop. If BGP
load balancing is configured, the local router specifies itself as the next hop of
outbound routes to a peer/peer group regardless of whether the peer
next-hop-local command is configured.
In a "third party next hop" network, that is, the two EBGP peers reside in a
■
common broadcast subnet, the router does not specify itself as the next hop

Configuring IPv6 BGP Route Attributes

Use the command...
dampening [ half-life-reachable
half-life-unreachable reuse suppress
ceiling | route-policy
route-policy-name ]*
Use the command...
system-view
bgp as-number
preference
{ external-preference
internal-preference
local-preference |
route-policy
route-policy-name }
default local-preference
value
peer { ipv6-group-name |
ipv6-address }
next-hop-local
1023
Remarks
Optional
Not configured by
default
Remarks
-
Required
-
Optional
The default preference values
of external, internal and local
routes are 255, 255, 130
respectively
Optional
The value defaults to 100
Required
By default, the feature is
available for routes advertised
to the EBGP peer/peer group,
but not available to the IBGP
peer/peer group