Cisco Cisco IOS Software Release 12.2(33)SRE
VPLS Autodiscovery: BGP Based
Information About VPLS Autodiscovery: BGP Based
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Cisco IOS Release 12.2(33)SRA
Information About VPLS Autodiscovery: BGP Based
To understand VPLS Autodiscovery, you should understand the following concepts:
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How the VPLS Feature Works
VPLS allows Multiprotocol Label Switching (MPLS) networks to provide multipoint Ethernet LAN
services, also known as Transparent LAN Services (TLS). All customer sites in a VPLS appear to be on
the same LAN, even though those sites might be in different geographic locations.
services, also known as Transparent LAN Services (TLS). All customer sites in a VPLS appear to be on
the same LAN, even though those sites might be in different geographic locations.
How the VPLS Autodiscovery: BGP Based Feature Works
VPLS Autodiscovery enables each VPLS PE router to discover the other PE routers that are part of the
same VPLS domain. VPLS Autodiscovery also tracks when PE routers are added to or removed from the
VPLS domain. The autodiscovery and signaling functions use BGP to find and track the PE routers.
same VPLS domain. VPLS Autodiscovery also tracks when PE routers are added to or removed from the
VPLS domain. The autodiscovery and signaling functions use BGP to find and track the PE routers.
BGP uses the L2VPN Routing Information Base (RIB) to store endpoint provisioning information,
which is updated each time any Layer 2 VFI is configured. Prefix and path information is stored in the
L2VPN database, allowing BGP to make decisions on the best path. When BGP distributes the endpoint
provisioning information in an update message to all its BGP neighbors, the endpoint information is used
to configure a pseudowire mesh to support L2VPN-based services.
which is updated each time any Layer 2 VFI is configured. Prefix and path information is stored in the
L2VPN database, allowing BGP to make decisions on the best path. When BGP distributes the endpoint
provisioning information in an update message to all its BGP neighbors, the endpoint information is used
to configure a pseudowire mesh to support L2VPN-based services.
The BGP autodiscovery mechanism facilitates the configuration of L2VPN services, which are an
integral part of the Cisco IOS Virtual Private LAN Service (VPLS) feature. VPLS enables flexibility in
deploying services by connecting geographically dispersed sites as a large LAN over high-speed
Ethernet in a robust and scalable IP MPLS network. For more information about BGP and the L2VPN
address family in relation to VPLS Autodiscovery, see the following documents:
integral part of the Cisco IOS Virtual Private LAN Service (VPLS) feature. VPLS enables flexibility in
deploying services by connecting geographically dispersed sites as a large LAN over high-speed
Ethernet in a robust and scalable IP MPLS network. For more information about BGP and the L2VPN
address family in relation to VPLS Autodiscovery, see the following documents:
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The section called
“L2VPN Address Family” in the
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The document called
How Enabling VPLS Autodiscovery Differs from Manually Configuring VPLS
With VPLS Autodiscovery, you no longer need to manually set up the VPLS. The commands you use to
set up VPLS Autodiscovery are similar to those you use to manually configure a VPLS, as shown in
set up VPLS Autodiscovery are similar to those you use to manually configure a VPLS, as shown in
. VPLS Autodiscovery uses neighbor commands in L2VPN address family mode to distribute
endpoint information to configure a pseudowire.