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The MVPN BGP Auto Discovery feature enables automated discovery of Provider Edge (PE) routers in an MVPN network using Border Gateway Protocol (BGP) for obtaining multicast VPN (MVPN) controlled information.
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.
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Information about MVPN BGP Auto Discovery
BGP is an Exterior Gateway Protocol (EGP) that allows you to set up an interdomain routing system that automatically guarantees the loop-free exchange of routing information between autonomous systems. Border Gateway Protocol (BGP) facilitates communication, discovery, and maintenance of the MVPN membership.
Provider Edge (PE) routers in a Multicast Virtual Private Networks (MVPN) need to communicate with each other to obtain MVPN controlled information. MVPN BGP auto discovery refers to each PE router discovering all the other routers in MVPN network. PE routers use the MVPN BGP auto discovery feature to advertise its MVPN membership to other routers.
MVPN BGP auto discovery uses different kinds of routes known as MVPN Subaddress Family Identifier Information (MVPN-SAFI) or Auto Discovery (A-D) routes. A-D routes that are implemented in configuring MVPN BGP Auto Discovery are Intra Autonomous System Inclusive Provider Multicast Service Interface (Intra-AS I-PMSI) A-D route and Selective Provider Multicast Service Interface (S-PMSI).
The Intra-AS I-PMSI A-D route starts from the Provider Edge routers (PEs) that are directly connected to an MVPN site and then the router information is distributed to other PEs that are attached to MVPN sites. S-PMSI is used to bind customer multicast flows to tunnels through a service provider’s network.
How to Configure MVPN BGP Auto Discovery
1.
enable
2.
configure terminal
3.
vrf definition
vrf-name
4.
address-family ipv4
5.
mdt auto-discovery pim
6.
mdt default
group-address
7.
end
8.
show bgp ipv4 mvpn vrf
vrf-name
Configuration Examples for MVPN BGP Auto Discovery
The following example shows how to enable a PE router in an MVPN network to communicate with each other using BGP:
enable configure terminal vrf definition vrf1 rd 103:1 vpn id 1:1 route-target export 1:1 route-target import 1:1 ! address-family ipv4 mdt auto-discovery pim mdt default 239.0.0.1 exit-address-family ! router bgp 100 neighbor 11.11.11.11 remote-as 100 neighbor 11.11.11.11 update-source Loopback0 ! address-family ipv4 neighbor 11.11.11.11 activate exit-address-family ! address-family ipv4 mvpn neighbor 11.11.11.11 activate neighbor 11.11.11.11 send-community extended exit-address-family ! address-family vpnv4 neighbor 11.11.11.11 activate neighbor 11.11.11.11 send-community extended exit-address-family !
The following example displays BGP routing table of a PE router in an MVPN network:
Device# show bgp ipv4 mvpn vrf vrf1 BGP table version is 35, local router ID is 33.33.33.33 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 103:1 (default for vrf vrf1) *>i [1][103:1][11.11.11.11]/12 11.11.11.11 0 100 0 ? *>i [1][103:1][22.22.22.22]/12 22.22.22.22 0 100 0 ? *> [1][103:1][33.33.33.33]/12 0.0.0.0 32768 ? *>i [1][103:1][44.44.44.44]/12 44.44.44.44 0 100 0 ? *>i [5][103:1][1.1.1.1][232.0.0.1]/18 22.22.22.22 0 100 0 ?
Related Topic |
Document Title |
---|---|
Cisco IOS commands |
|
IP multicast commands |
Standard/RFC |
Title |
---|---|
RFC 6514 |
BGP Encodings and Procedures for Multicast in MPLS/BGP IP VPNs |
RFC 6513 |
Multicast in MPLS/BGP IP VPNs |
Description |
Link |
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The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
---|---|---|
MVPN BGP Auto Discovery |
15.2(2)S |
This feature enables automated discovering of Provider Edge (PE) routers in an MVPN network using Border Gateway Protocol (BGP) for obtaining multicast VPN (MVPN) controlled information. The following commands were modified: mdt auto-discovery pim, show bgp ipv4 mvpn vrf, vrf definition. |