Configuring Ldp Signaling For Vpls - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Configuring LDP Signaling for VPLS

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You can configure LDP as the signaling protocol for a VPLS routing instance. This
functionality is described in RFC 4762, Virtual Private LAN Service (VPLS) Using Label
Distribution Protocol (LDP) Signaling.
The Junos OS software does not support all of RFC 4762. When enabling LDP signaling
for a VPLS routing instance, network engineers should be aware that only the following
values are supported:
FEC— or
128 129
Control bit—
0
Ethernet pseudowire type—
Ethernet tagged mode pseudowire type—
LDP signaled VPLS supports the Virtual Circuit Connectivity Verification (VCCV) Type
Length Value (TLV) for pseudowire label mapping, label database display, and LDP
trace. When you enable LDP signaling for a pseudowire, LDP advertises the VCCV
capabilities to the neighboring routers. VCCV provides a control channel for a pseudowire
and includes both operations and management functions (for example, connectivity
verification). This control channel is established between the pseudowire's ingress and
egress devices. Once established, connectivity verification messages can be sent over
the VCCV control channel.
The Junos OS software supports the following VCCV capabilities for LDP signaled VPLS
(defined in RFC 5085 Section 8.1):
VCCV connectivity check types:
Router Alert Label
MPLS pseudowire label with TTL=1
VCCV connectivity verification type:
LSP ping
If the peer device also advertises VCCV parameters during pseudowire setup, the Junos
OS software selects the set of common advertised parameters to use as the method for
performing VCCV OAM on the pseudowire.
The locally advertised and peer advertised VCCV parameters can be viewed using the
show ldp database command as show here:
user@host> show ldp database l2circuit extensive
Input label database, 10.255.245.198:0--10.255.245.194:0
Label Prefix
299872 L2CKT CtrlWord PPP VC 100
MTU: 4470
VCCV Control Channel types:
MPLS router alert label
MPLS PW label with TTL=1
0x0005
0x0004
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