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Home Documentation Junos OS BGP User Guide Configuring BGP-Based VPN

BGP User Guide

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BGP accept-own Community

date_range 20-Dec-24
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Understanding BGP accept-own Community Attribute

Benefits of BGP accept-own Community Attribute

  • Helps to leak routes from one VPN instance to another on the same provider edge(PE) device.

  • Convenient in VPN deployment scenarios where BGP route reflector controls how a route originated from one VRF is imported to another VRF on the same provider edge (PE) device.

  • Enhances interoperability while replacing non-Junos routers with Junos routers on customer networks.

Overview of BGP accept-own Community Attribute

Per the standard BGP specification, a BGP speaker rejects routes received with the following attributes:

  • The originator id set to itself.

  • The nexthop attribute same as that of the receiver’s own IP address.

Starting in Junos OS Release 21.4R1, MX480 and MX960 routers accept BGP routes with the accept-owncommunity, defined by RFC 7611, BGP ACCEPT_OWN Community Attribute. The feature enables Juniper routers to accept routes whose ORIGINATOR_ID or NEXT_HOP value matches that of the receiving BGP speaker. For example, when a provider edge (PE) device advertises routes with the route distinguisher of a source VRF, the route reflector attaches the accept-own community, adds more route targets, and re-advertises the routes back to the originator. The provider edge (PE) device can then import the routes into the other destination VRFs, excluding its own.

Note:

We support accept-own configuration only for inet-vpn unicast and inet6-vpn unicast address families.

Per RFC 7611, routes attached with ACCEPT_OWN community should be preferred over routes that do not have the community after the LOCAL_PREF comparison is done in the BGP decision process.

See Also

Configure BGP accept-own Community

Before you configure accept-own community, make sure you:

  1. Configure the device interfaces.

  2. Configure router ID and autonomous system number.

  3. Configure OSPF or any other IGP protocol.

  4. Configure LDP.

  5. Configure MPLS.

The sections shows how to enable the routers to accept routes with the accept-own community from a route reflector.
  1. Configure an internal BGP connection.
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    user@PE# 
set protocols bgp group group type internal
set protocols bgp group group local-address local-address
set protocols bgp group group neighbor neighbor-address
  2. Configure policy options to export and accept static routes, add them to a community with a specified route target. Configure a unique route target for the added community.
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    user@PE#
set policy-options policy-statement exportpolicy from protocol static
set policy-options policy-statement exportpolicy then community add community
set policy-options policy-statement exportpolicy then accept

set policy-options policy-statement importpolicy from community community
set policy-options policy-statement importpolicy then accept
set policy-options community community members targetcommunity:ID1
  3. Configure two routing instances with unique route distinguishers and route target to create two VRFs with route export and import. Configure a static route with a next-hop address.
    content_copy zoom_out_map
    user@PE# 
set routing-instances vrf1 instance-type vrf
set routing-instances vrf1 route-distinguisher route-distinguisher
set routing-instances vrf1 routing-options static route route next-hop address
set routing-instances vrf1 interface interface
set routing-instances vrf1 vrf-import importpolicy
set routing-instances vrf1 vrf-export exportpolicy
set routing-instances vrf2 instance-type vrf
set routing-instances vrf2 route-distinguisher route-distinguisher2
set routing-instances vrf2 vrf-target targetcommunity:ID2
  4. Configure the following statement to enable accept-own community.
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    user@PE#
set protocols bgp group group neighbor address family inet-vpn unicast accept-own
  5. Enter commit to commit the configuration.

See Also

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