3Com 4800G Series, Руководство по настройке

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Configuring IPv6 BGP Route Attributes 475
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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.
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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
for routes to the EBGP peer by default, unless the
peer next-hop-local
command is configured.
Configuring the MED
Attribute
Follow these steps to configure the MED attribute:
Configuring the
AS_PATH Attribute
Follow these steps to configure the AS_PATH attribute:
Configure the default value
for local preference default local-preference
value
Optional
The value defaults to 100
Advertise routes to a
peer/peer group with the local
router as the next hop peer { ipv6-group-name |
ipv6-address }
next-hop-local
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
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number Required
Enter IPv6 address family
view ipv6-family -
Configure a default MED
value default med med-value Optional
Defaults to 0
Enable to compare MED
values of routes from
different EBGP peers compare-different-as-med Optional
Not enabled by default
Prioritize MED values of
routes from each AS bestroute compare-med Optional
Not configured by default
Prioritize MED values of
routes from confederation
peers bestroute
med-confederation Optional
Not configured by default
To do… Use the command… Remarks
Enter system view system-view -
Enter BGP view bgp as-number Required
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 peer { ipv6-group-name |
ipv6-address } allow-as-loop
[ number ]
Optional
Not allowed by default