238
2. Enter BGP IPv6 unicast
address family view,
BGP-VPN IPv6 unicast
address family view, or BGP
IPv6 multicast address family
view.
• Enter BGP IPv6 unicast
address family view:
a. bgp as-number
[ instance
instance-name ]
b. address-family ipv6
[ unicast ]
• Enter BGP-VPN IPv6 unicast
address family view:
c. bgp as-number
[ instance
instance-name ]
d. ip vpn-instance
vpn-instance-name
e. address-family ipv6
[ unicast ]
• Enter BGP IPv6 multicast
address family view:
f. bgp as-number
[ instance
instance-name ]
g. address-family ipv6
N/A
3. Advertise a default route to a
peer or peer group.
peer
{ group-name | ipv6-address
[ prefix-length ] }
default-route-advertise
[
route-policy
route-policy-name ]
By default, no default route is
advertised.
Configuring BGP to first send updates of the default route
About configuring BGP to first send updates of the default route
Typically a BGP router does not first send update messages of the default route to its peers. If the
peer relationship is down, the default route cannot be withdrawn first. Traffic interruption might occur.
Perform this task to configure BGP to first send the update message of the default route. This can
reduce the traffic interruption time when the peer relationship is down.
As shown in Figure 60, Device A and Device B send a default route and large numbers of external
routes to the internal network. After optimal route selection, Device E selects Device A as the egress
router to reach the external network. If the peer relationship between Device A and Device C is down,
Device C sends route withdrawal messages to Device E. If the withdrawal message of the default
route is not sent first, traffic forwarded through the default route will be interrupted. After you
configure this task, traffic can be immediately switched to Device D to reduce traffic interruption time.
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