Configuring Bgp Filtering With Route Maps - Cisco 3845 - Security Bundle Router Software Manual

Configuring BGP
Command
Step 4
neighbor {ip-address | peer-group-name} next-hop-self (Optional) Disable next-hop processing on BGP updates
Step 5 neighbor {ip-address | peer-group-name} weight
weight
Step 6
default-metric number
Step 7
bgp bestpath med missing-as-worst
Step 8
bgp always-compare med
Step 9
bgp bestpath med confed
Step 10
bgp deterministic med
Step 11 bgp default local-preference value
Step 12 maximum-paths number
Step 13 end
Step 14 show ip bgp
show ip bgp neighbors
Step 15
copy running-config startup-config
Use the no form of each command to return to the default state.

Configuring BGP Filtering with Route Maps

Within BGP, you can use route maps to control and to modify routing information and to define the
conditions by which routes are redistributed between routing domains. See the
Redistribute Routing Information" section on page 29-97
route map has a name that identifies the route map (map tag) and an optional sequence number.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
29-50
Chapter 29
Purpose
to a neighbor by entering a specific IP address to be used
instead of the next-hop address.
(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.
(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.
(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.
(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.
(Optional) Configure the switch to consider the MED in
choosing a path from among those advertised by different
subautonomous systems within a confederation.
(Optional) Configure the switch to consider the MED
variable when choosing among routes advertised by
different peers in the same AS.
(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.
(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.
Return to privileged EXEC mode.
Verify the reset by checking information about the routing
table and about BGP neighbors.
(Optional) Save your entries in the configuration file.
for more information about route maps. Each
Configuring IP Unicast Routing
"Using Route Maps to
OL-23400-01