DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide
89
EXTCOMMUNITY
(Optional) Consists of a set of an
rt
VALUE
or a
soo
VALUE
. It can accept 12
VALUE
s in total for one entry.
There are two different types for the
rt
values or
soo
values:
•
IP address:number:
The IP address should be a global IP address that is
assigned to the user and the number is assigned from a numbering space that is
administered by the user. The number can be 1-65535.
•
AS number:number:
The AS Number should be a public AS Number (Both 2-
bytes AS number and 4-bytes AS number works) that is assigned to the user and
the number is assigned from a numbering space that is administered by the user.
The number can be 1-4294967295 for 2-bytes AS number and 1-65535 for 4-
bytes AS number.
REGEXP
(Optional) Configures a regular expression that is used to specify a pattern to match
against an input string. Regular expressions can be used only with expanded
community lists. The maximum length is 80 characters.
Default
BGP extended community exchange is disabled by default. It is enabled on a per-
neighbor basis with the
neighbor send-community
command.
Command Mode
Global Configuration Mode.
Command Default Level
Level: 8. (
EI Mode Only Command
)
Usage Guideline
The extended community attribute is used for implementing policy routing. It is an
optional, transitive attribute and facilitates transfer of local policies through different
autonomous systems. All names of the standard extcommunity list and expended
extcommunity list must not be the same.
This command can be applied multiple times. BGP extended community attributes
exchanged between BGP peers are controlled by the
neighbor send-community
command.
If permit rules exist in an extended community list, routes with extended community
that does not match any rule in the list will be denied. If there are no rules or only
deny rules to be configured in the extended community list, all routes will be denied.
Use the
show ip extcommunity-list
command to verify your settings.
Example
The following example defines a standard extended community list named
myecom
with an entry.
DXS-3600-32S(config)# ip extcommunity-list standard myecom permit rt 1:1 soo 1.1.1.1:1
DXS-3600-32S(config)#
Example
The following example show how to delete an entry in an extended community list
early configured. After that, the community list
myecom
has no entry, but it still exists.
DXS-3600-32S(config)#no ip extcommunity-list standard myecom permit rt 1:1 soo 1.1.1.1:1
DXS-3600-32S(config)#
Example
The following example show how to delete an extended community list no matter
whether it has entries or not.
DXS-3600-32S(config)# no ip extcommunity-list standard myecom
DXS-3600-32S(config)#
Example
The following example creates an expanded extended community list named
myexpcom
with an entry.
DXS-3600-32S(config)# ip extcommunity-list expanded myexpcom permit _20[0-9]
DXS-3600-32S(config)#
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