232
f. bgp as-number
[ instance
instance-name ]
g. address-family ipv6
3. Advertise a default route to a
peer or peer group.
peer
{ group-name | ipv6-address
[ prefix-length ] }
default-route-advertise
[
route-policy-name ]
By default, no default route is
advertised.
Limiting routes received from a peer or peer group
This feature can prevent attacks that send a large number of BGP routes to the router.
If the number of routes received from a peer or peer group exceeds the upper limit, the router takes
one of the following actions based on your configuration:
• Tears down the BGP session to the peer or peer group and does not attempt to re-establish the
session.
• Continues to receive routes from the peer or peer group and generates a log message.
• Retains the session to the peer or peer group, but it discards excess routes and generates a log
message.
• Tears down the BGP session to the peer or peer group and, after a specific period of time,
re-establishes a BGP session to the peer or peer group.
You can specify a percentage threshold for the router to generate a log message. When the ratio of
the number of received routes to the maximum number reaches the percentage value, the router
generates a log message.
To limit routes that a router can receive from a peer or peer group (IPv4 unicast/multicast address
family):
1. Enter system view.
system-view
N/A
2. Enter BGP IPv4 unicast
address family view,
BGP-VPN IPv4 unicast
address family view, or BGP
IPv4 multicast address family
view.
• Enter BGP IPv4 unicast
address family view:
a. bgp as-number
[ instance
instance-name ]
b. address-family ipv4
[ unicast ]
• Enter BGP-VPN IPv4 unicast
address family view:
c. bgp as-number
[ instance
instance-name ]
d. ip vpn-instance
vpn-instance-name
e. address-family ipv4
[ unicast ]
• Enter BGP IPv4 multicast
address family view:
f. bgp as-number
N/A
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