Chapter 50
| IP Routing Commands
Border Gateway Protocol (BGPv4)
– 1102 –
Command Usage
This command sets the interval at which to check the validity of the next hop for all
routes in the routing information database. During the interval between scan
cycles, IGP instability or other network problems may cause black holes or routing
loops to form.
Example
Console(config-router)#bgp scan-time 30
Console(config-router)#
network This command specifies a network to advertise. Use the no form to stop advertising
a network.
Syntax
network ip-address [netmask] [route-map map-name | [backdoor]
pathlimit ttl]
no network ip-address [netmask]
ip-address – IP address of a to advertise.
netmask – Network mask for the route. This mask identifies the network
address bits used for the associated routing entries.
map-name – Name of the route map. The route map can be used to filter
the networks to advertise. (Range: 1-80 characters)
backdoor – Specifies a backdoor route to a BGP border router that
provides better information about the network.
pathlimit ttl – Maximum number of hops allowed in an AS path.
(Range: 0-255)
Command Mode
Router Configuration
Default Setting
No networks are configured.
Command Usage
â—† Use this command to specify the networks to advertise to BGP neighbors. BGP
networks can be learned from directly connected routes, dynamic routing, or
static route sources.
â—† BGP only sends and receives updates on interfaces specified by this command.
If a network is not specified, the interfaces in that network will not be
advertised in any BGP updates.
â—† A backdoor network has an administrative distance of 200, making routes
learned through interior gateway protocols (RIP, OSPF, iBGP) preferred. A
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