Cisco Router Challenge 84
Outline
This challenge involves the configuration of BGP for a default
local-preference using a route-map.The objectives of
this challenge are to:
- Define BGP.
- Defines neighbors.
- Define local-preference with a route-map.
Commands
# config
t
(config)#
access-list 1 permit 1 10.0.0.0 0.0.0.255
(config)#
route-map test
(config-route-map)# match ip address 1
(config-route-map)# set local-preference 14
(config-route-map)# exit
(config)#
router bgp 172
(config-router)# neighbor 11.11.11.11
remote-as 300
(config-router)# neighbor 11.11.11.11
route-map test out
(config-router)# network 160.0.0.0
Example
# config
t
(config)#
access-list 1 permit 1 10.0.0.0 0.0.0.255
(config)#
route-map test
Router(config-route-map)# ?
Route Map configuration commands:
default Set a command to its defaults
description Route-map
comment
exit Exit from route-map configuration mode
help Description of the interactive help
system
match Match values
from routing table
no Negate a command or set its defaults
set Set values
in destination routing protocol
(config-route-map)# match ?
as-path Match BGP AS path list
community Match BGP community list
extcommunity Match BGP/VPN
extended community list
interface Match first hop interface of route
ip IP
specific information
length Packet length
metric Match metric of route
route-type Match route-type of route
tag Match tag of route
(config-route-map)# m ip
?
address Match address of route or match packet
next-hop Match next-hop address of route
route-source Match advertising source address of
route
(config-route-map)# match ip address ?
<1-199> IP access-list number
<1300-2699> IP access-list number (expanded range)
WORD
IP access-list name
prefix-list Match entries of prefix-lists
<cr>
(config-route-map)# match ip address 1
(config-route-map)# set ?
as-path Prepend
string for a BGP AS-path attribute
automatic-tag Automatically compute TAG value
comm-list set BGP
community list (for deletion)
community BGP community attribute
dampening Set BGP route flap dampening
parameters
default Set default information
extcommunity BGP extended community attribute
interface Output interface
ip IP
specific information
level Where to import route
local-preference BGP local preference path attribute
metric Metric
value for destination routing protocol
metric-type Type of metric for destination routing
protocol
origin BGP origin code
tag Tag
value for destination routing protocol
traffic-index BGP traffic classification number for
accounting
weight BGP weight for routing table
(config-route-map)# set local-preference?
<0-4294967295> Preference value
<cr>
(config-route-map)# set local-preference 14
(config-route-map)# exit
(config)#
router bgp 172
(config-router)# nei
1.2.3.4 remote-as ?
<1-65535> AS of remote neighbor
(config-router)# nei
1.2.3.4 remote-as 300 ?
<cr>
(config-router)# neighbor 11.11.11.11
remote-as 300
(config-router)# neighbor 11.11.11.11
route-map test ?
in Apply map to
incoming routes
out Apply map to
outbound routes
(config-router)# neighbor 11.11.11.11
route-m test in ?
<cr>
(config-router)# neighbor 11.11.11.11
route-map test out
(config-router)# network 160.0.0.0
Topology
The basic topology is defined below, where AS1 is connected to E0, AS2 to
S0, and AS3 to S1.
