Apply a BGP4+ Extended Community Filter

You can apply an extended community filter to a neighbor through a route map.

Before you begin

Procedure

Access global configuration mode.
```
device# configure terminal
```
Define the matching conditions for the extended community.
```
device(config)# ip extcommunity-list standard mylist permit rt 123:2
```
This example specifies that community list 1 permits routes from network 2 in autonomous system 123.
Access BGP configuration mode.
```
device(config)# router bgp
```
Specify the autonomous system in which your device resides.
```
device(config-bgp-router)# local-as 1000
```

Specify the autonomous system in which the remote neighbor resides.

device(config-bgp-router)# neighbor fe80:4398:ab30:45de::1 remote-as 1001

Access IPv6 address family configuration mode.

device(config-bgp-router)# address-family ipv6 unicast

Enable the exchange of information with the neighbor.

device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 activate

Apply a route map to incoming routes.
```
device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 route-map in extComRmapt 
```
This example uses the in keyword to apply route map extComRmapt.
Apply a route map to outgoing routes.
```
device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 route-map out sendExtComRmap 
```
This example uses the keyword out to apply route map sendExtComrmap.
Enable the sending of standard and extended attributes in updates to the specified BGP neighbor.
```
device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 send-community both
```
This example uses the send-community both keywords.

Example

The following example summarizes the commands in this procedure.

device# configure terminal
device(config)# ip extcommunity-list standard mylist permit rt 123:2
device(config)# router bgp
device(config-bgp-router)# local-as 1000
device(config-bgp-router)# neighbor fe80:4398:ab30:45de::1 remote-as 1001
device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 activate
device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 route-map in extComRmap 
device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 route-map out sendExtComRmap 
device(config-bgp-ipv6u)# neighbor fe80:4398:ab30:45de::1 send-community both