Default-Route Imported - 3Com 8807 Command Reference Manual

BGP Configuration Commands 505
Description
Use the default med command to configure the default system metric.
Use the undo default med command to restore the default metric of the system.
Multi-Exit Discriminators (MED) attribute is the external metric of a route. Different
from local preference, MED is exchanged between ASs. However, this attribute is
non-transitive. When a router running BGP gets routes with the same destination
address but different next hops from different external peers, it selects the route
with the smallest MED as the optimum route, provided that all other conditions
are the same.
Example
# Routers RTA and RTB belong to AS100 and router RTC belongs to AS200. RTC is
the peer of RTA and RTB. So the MED of RTA can be configured as 25 to allow RTC
to select the route transmitted by RTB first.
[3Com-bgp] default med 25

default-route imported

Syntax
default-route imported
undo default-route imported
View
BGP view
Parameter
None
Description
Use the default-route imported command to allow BGP to import the default
routes of other routing protocols.
Use the undo default-route imported command to filter their default routes
when BGP is importing other routing protocols.
When BGP is importing other routing protocols, BGP does not import their default
routes by default.
Example
# Configure a static default route.
<SW8800> system-view
[SW8800] ip route-static 0.0.0.0 0.0.0.0 NULL 0
# Import static routes into BGP.
[SW8800] bgp 100
[3Com-bgp] import-route static
# Find out that no static default route is imported into BGP.