ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Border Gateway Protocol (BGPv4)
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DEFAULT SETTING
No networks are configured.
COMMAND USAGE
◆ 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.
◆ 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.
◆ A backdoor network has an administrative distance of 200, making
routes learned through interior gateway protocols (RIP, OSPF, iBGP)
preferred. A backdoor network is treated as a local network, except
that it not advertised by the local router. A backdoor route should not
be sourced at the local router, but should be one that has been learned
from external neighbors. However, since these routes are treated as a
local network, they are given priority over routes learned through eBGP,
even if the distance of the external route is shorter.
EXAMPLE
Console(config-router)#network 172.16.0.0 255.255.0.0
Console(config-router)#
redistribute This command redistributes routes from one routing domain to another.
Use the no form to stop redistributing an previously configured entry.
SYNTAX
redistribute {connected | ospf | rip | static} [metric metric-value]
[route-map map-name]
no redistribute {connected | ospf | rip | static}
[metric metric-value] [route-map map-name]
connected - Imports routes that are established automatically just
by enabling IP on an interface.
ospf - External routes will be imported from the Open Shortest Path
First (OSPF) protocol into this routing domain.
rip - External routes will be imported from the Routing Information
Protocol (RIP) into this routing domain.
static - Static routes will be imported into this routing domain.
metric-value - Metric value assigned to all external routes for the
specified protocol. (Range: 1-16)
map-name – Name of the route map. The route map can be used to
filter the networks to advertise, and to modify their weight or other
attributes. (Range: 1-80 characters)