OAM and SAA
7750 SR OS Services Guide Page 1375
A VCCV-ping is an LSP echo request message as defined in the LSP ping specification. It
contains a Layer 2 FEC stack TLV in which it must include the sub-TLV type 10 FEC 128
pseudowire. It also contains a field which indicates to the destination PE which reply mode to use.
There are four reply modes defined:
The 7750 SR supports the following reply modes:
• Reply by an IPv4/IPv6 UDP packet.
• Reply by application-level control channel. This mode sends the reply message in-band
over the PW from PE2 to PE1. PE2 will encapsulate the echo reply message using the CC
type negotiated with PE1. This is the default mode of operation.
The reply is an LSP echo reply message as defined in the specification. The message is sent as per
the reply mode requested by PE1. The return codes supported are the same as those supported
today in the 7750 SR LSP ping capability
The VCCV ping feature is in addition to the service ping OAM feature which can be used to test a
service between 7750 SR nodes. The VCCV ping feature can test connectivity of a VLL with any
third party node which is compliant to draft-ietf-pwe3-vccv-xx.txt.
VCCV-Ping in a Multi-Segment Pseudowire
Figure 72 displays and example of an application of VCCV ping over a multi-segment
pseudowire.
Figure 2: VCCV-Ping over a Multi-Segment Pseudowire
IP/MPLS
FR PW
segment 2
FR SAP
1/1/1:200
FR SAP
1/1/1:100
CE 1
[64.47.30.1/30]
CE 2
[64.47.30.2/30]
7750 SR
T-PE 1 S-PE T-PE 2
7750 SR
E2E
VCCV Ping
VCCV echo
request
VCCV echo
reply
VCCV
echo
request
VCCV
echo
reply
Segment
VCCV Ping
7750 SR
FR PW
segment 1
OSSG113
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