Setup Guide

2. Two types of extended communities are supported.
CONFIG-COMMUNITY-LIST mode
{permit | deny} {{rt | soo} {ASN:NN | IPADDR:N} | regex REGEX-LINE}
Filter routes based on the type of extended communities they carry using one of the following keywords:
● rt: route target.
● soo: route origin or site-of-origin. Support for matching extended communities against regular expression is also
supported. Match against a regular expression using the following keyword.
● regexp: regular expression.
To set or modify an extended community attribute, use the set extcommunity {rt | soo} {ASN:NN | IPADDR:NN}
command.
To view the configuration, use the show config command in CONFIGURATION COMMUNITY-LIST or CONFIGURATION
EXTCOMMUNITY LIST mode or the show ip {community-lists | extcommunity-list} command in EXEC Privilege
mode.
DellEMC#show ip community-lists
ip community-list standard 1
deny 701:20
deny 702:20
deny 703:20
deny 704:20
deny 705:20
deny 14551:20
deny 701:112
deny 702:112
deny 703:112
deny 704:112
deny 705:112
deny 14551:112
deny 701:667
deny 702:667
deny 703:667
deny 704:666
deny 705:666
deny 14551:666
DellEMC#
Configure BGP attributes
Following sections explain how to configure the BGP attributes such as MED, COMMUNITY, WEIGHT, and
LOCAL_PREFERENCE.
Changing MED Attributes
By default, Dell EMC Networking OS 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.
CONFIG-ROUTER-BGP mode
bgp bestpath med {confed | missing-as-best}
○ confed: Chooses the bestpath MED comparison of paths learned from BGP confederations.
○ missing-as-best: Treat a path missing an MED as the most preferred one.
To view the nondefault values, use the show config command in CONFIGURATION ROUTER BGP mode.
Border Gateway Protocol (BGP)
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