Default Med; Display Bgp Multicast Group - 3Com 8807 Command Reference Manual

658 C 38: MBGP M E C C
HAPTER ULTICAST XTENSION ONFIGURATION OMMANDS
[3Com-bgp] ipv4-family multicast
[3Com-bgp-af-mul] default local-preference 180

default med

Syntax
default med med-value
undo default med
View
IPv4 multicast sub-address family view
Parameter
med-value: MED value, in the range of 0 to 4294967295. By default, it is 0.
Description
Use the default med command to configure system MED value.
Use the display bgp multicast group command to restore the default value.
Multi-exit discriminator (MED) attribute is the external metric for a route. Unlike
local precedence attribute, MED is exchanged, between ASs, and one it enters an
AS, it does not leave the AS. MED attribute is used in best route selection. When a
router running BGP travels through different external peers and get the routes
with identical destination, but different next-hop addresses, it selects these routes
according to their MED values. The route with smaller MED value will be selected
as the external AS route if other attributes are the same.
Example
# Configure system MED value as 25.
<SW8800> system-view
System View: return to User View with Ctrl+Z.
[SW8800] bgp 100
[3Com-bgp] ipv4-family multicast
[3Com-bgp-af-mul] default med 25
display bgp multicast Syntax
group
display bgp multicast group [ group-name ]
View
Any view
Parameter
group-name: Peer group. If no peer group is specified, the information about all
peer groups will be displayed.
Description
Use the display bgp multicast group command to view the information about
peer groups.