H3C Technologies H3C S5560 Series Switches - Manual (Page 235)

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Advertising a default route to a peer or peer group
Perform this task to advertise a default BGP route with the next hop being the advertising router to a peer
or peer group.
To advertise a default route to a peer or peer group (IPv4):
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ip vpn-instance
vpn-instance-name
N/A
3. Enter BGP IPv4 unicast
address family view or
BGP-VPN IPv4 unicast
address family view.
address-family ipv4 [ unicast ] N/A
4. Advertise a default route to a
peer or peer group.
peer { group-name | ip-address
[ mask-length ] }
default-route-advertise
[ route-policy route-policy-name ]
By default, no default route is
advertised.
To advertise a default route to a peer or peer group (IPv6):
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter BGP view. bgp as-number N/A
3. Enter BGP IPv6 unicast
address family view.
address-family ipv6 [ unicast ] N/A
4. 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.
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.