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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 35 Configuring IP Unicast Routing
Configuring BGP
Use the no form of each command to return to the default state.
Configuring BGP Filtering with Route Maps
Within BGP, route maps can be used to control and to modify routing information and to define the
conditions by which routes are redistributed between routing domains. See the
“Using Route Maps to
Redistribute Routing Information” section on page 35-92 for more information about route maps. Each
route map has a name that identifies the route map (map tag) and an optional sequence number.
Step 4
neighbor {ip-address | peer-group-name} next-hop-self (Optional) Disable next-hop processing on BGP updates
to a neighbor by entering a specific IP address to be used
instead of the next-hop address.
Step 5
neighbor {ip-address | peer-group-name} weight
weight
(Optional) Assign a weight to a neighbor connection.
Acceptable values are from 0 to 65535; the largest weight
is the preferred route. Routes learned through another
BGP peer have a default weight of 0; routes sourced by the
local router have a default weight of 32768.
Step 6
default-metric number (Optional) Set a MED metric to set preferred paths to
external neighbors. All routes without a MED will also be
set to this value. The range is 1 to 4294967295. The lowest
value is the most desirable.
Step 7
bgp bestpath med missing-as-worst (Optional) Configure the switch to consider a missing
MED as having a value of infinity, making the path
without a MED value the least desirable path.
Step 8
bgp always-compare med (Optional) Configure the switch to compare MEDs for
paths from neighbors in different autonomous systems. By
default, MED comparison is only done among paths in the
same AS.
Step 9
bgp bestpath med confed (Optional) Configure the switch to consider the MED in
choosing a path from among those advertised by different
subautonomous systems within a confederation.
Step 10
bgp deterministic med (Optional) Configure the switch to consider the MED
variable when choosing among routes advertised by
different peers in the same AS.
Step 11
bgp default local-preference value (Optional) Change the default local preference value. The
range is 0 to 4294967295; the default value is 100. The
highest local preference value is preferred.
Step 12
maximum-paths number (Optional) Configure the number of paths to be added to
the IP routing table. The default is to only enter the best
path in the routing table. The range is from 1 to 8. Having
multiple paths allows load balancing among the paths.
Step 13
end Return to privileged EXEC mode.
Step 14
show ip bgp
show ip bgp neighbors
Verify the reset by checking information about the routing
table and about BGP neighbors.
Step 15
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose