3Com Switch 4800G 24-Port Configuration Manual page 387

To do...
Configure Configure the default
the MED MED value
attribute
Enable the comparison of
MED of routes from
different ASs
Enable the comparison of
MED of routes from each
AS
Enable the comparison of
MED of routes from
confederation peers
Specify the router as the next hop of
routes to a peer/peer group
Configure Configure repeating times
the of local AS number in
AS_PATH routes from a peer/peer
attribute group
Disable the router from
taking AS_PATH as a
factor for best route
selection
Specify a fake AS number
for a peer/peer group
Substitute local AS
number for the AS
number of a peer/peer
group in the AS_PATH
attribute
Configure BGP to not
keep private AS number
in AS_PATH of updates to
a peer/peer group
n
Using a routing policy can set preferences for routes matching it. Routes not
■
matching it use the default preferences.
If other conditions are identical, the route with the smallest MED value is
■
selected as the best external route.
Configuring BGP Route Attributes
Use the command...
default med med-value
compare-different-as-med
bestroute compare-med
bestroute
med-confederation
peer { group-name |
ip-address } next-hop-local
peer { group-name |
ip-address } allow-as-loop
[ number ]
bestroute as-path-neglect
peer { group-name |
ip-address } fake-as
as-number
peer { group-name |
ip-address } substitute-as
peer { group-name |
ip-address } public-as-only
387
Remarks
Optional
0 by default
Optional
Not enabled by
default
Optional
Not enabled by
default
Optional
Not enabled by
default
Optional
By default, routes to
an EBGP peer/peer
group take the
router as the next
hop, while routes to
an IBGP peer/peer
group do not take
the local router as
the next hop.
Optional
The local AS number
can not be repeated
in routes from the
peer/peer group.
Optional
By default, the router
takes AS_PATH as a
factor for best route
selection.
Optional
Not specified by
default
This command is only
applicable to an
EBGP peer or peer
group.
Optional
The substitution is
not configured by
default.
Optional
By default, BGP
updates carry private
AS numbers.