•none: remove the COMMUNITY attribute.
•additive: add the communities to already existing communities.
3. Return to CONFIGURATION mode.
CONFIG-ROUTE-MAP mode
exit
4. Enter the ROUTER BGP mode.
CONFIGURATION mode
router bgp as-number
5. Apply the route map to the neighbor or peer group’s incoming or outgoing routes.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} route-map map-name {in | out}
Example of the show ip bgp community Command
To view the BGP configuration, use the show config command in CONFIGURATION ROUTER BGP
mode. To view a route map configuration, use the show route-map command in EXEC Privilege mode.
To view BGP routes matching a certain community number or a pre-defined BGP community, use the
show ip bgp community command in EXEC Privilege mode.
Dell>show ip bgp community
BGP table version is 3762622, local router ID is 10.114.8.48
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i 3.0.0.0/8 195.171.0.16 100 0 209 701 80 i
*>i 4.2.49.12/30 195.171.0.16 100 0 209 i
* i 4.21.132.0/23 195.171.0.16 100 0 209 6461 16422 i
*>i 4.24.118.16/30 195.171.0.16 100 0 209 i
*>i 4.24.145.0/30 195.171.0.16 100 0 209 i
*>i 4.24.187.12/30 195.171.0.16 100 0 209 i
*>i 4.24.202.0/30 195.171.0.16 100 0 209 i
*>i 4.25.88.0/30 195.171.0.16 100 0 209 3561 3908 i
*>i 6.1.0.0/16 195.171.0.16 100 0 209 7170 1455 i
*>i 6.2.0.0/22 195.171.0.16 100 0 209 7170 1455 i
*>i 6.3.0.0/18 195.171.0.16 100 0 209 7170 1455 i
--More--
Changing MED Attributes
By default, the system uses the MULTI_EXIT_DISC or MED attribute when comparing EBGP paths from
the same AS.
To change how the MED attribute is used, enter any or all of the following commands.
• Enable MED comparison in the paths from neighbors with different ASs.
CONFIG-ROUTER-BGP mode
bgp always-compare-med
By default, this comparison is not performed.
• Change the bestpath MED selection.
Border Gateway Protocol IPv4 (BGPv4) 215