Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X, Configuration Manual

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You can specify both a route target community and a site-of-origin community
at the same time in a set clause without them overwriting each other.
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Example
host1(config)# route-map 1
host1(config-route-map)# set extcommunity rt 10.10.10.2:325
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Use the no version to remove the set clause from the route map.
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See set extcommunity.
show ip extcommunity-list
Use to display information about a specific extended community list or all
extended community lists.
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Example
host1# show ip extcommunity-list
IP Extended Community List dresden1:
permit soo 10.10.10.10:15
IP Extended Community List bonn:
deny rt 12:12
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See show ip extcommunity-list.
Using Regular Expressions
You can use regular expressions when you define AS-path access lists and community
lists to more easily filter routes. A regular expression uses special characters—often
referred to as metacharacters—to define a pattern that is compared with an input
string.
AS-path Lists
For an AS-path access list, the input string is the AS path of the routes to which the
list is applied with the
route-map or neighbor filter-list commands. If the AS path
matches the regular expression in the access list, the route matches the access list.
Example
The following commands apply access list 1 to routes inbound from BGP peer
10.5.5.2. Access list 1 uses a regular expression to deny routes that originate in
autonomous system 32.
host1(config-router)# neighbor 10.5.5.2 remote-as 32
host1(config-router)# neighbor 10.5.5.2 filter-list 1 in
host1(config-router)# exit
host1(config)# ip as-path access-list 1 deny 32$
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Using Regular Expressions
JUNOSe 11.1.x IP Services Configuration Guide