Configuring Mpls Ping For A Pw; Configuring Bfd For A Pw - HP MSR2000 Configuration Manual

The packets used to verify PW connectivity are collectively referred to as VCCV packets. A PE transfers
VCCV packets through a control channel (CC).
CCs include the following types:
control-word—Identifies VCCV packets through the control word (PW-ACH, PW Associated
•
Channel Header). You can use this CC type only when the PW supports control word. For more
information about control word, see "Configuring MPLS L2VPN."
• router-alert—Identifies a VCCV packet by adding an MPLS router alert label before the PW label.
Connectivity Verification (CV) tools include the following types:
• MPLS ping—Uses MPLS ping to verify PW connectivity.
BFD—Uses BFD to verify PW connectivity. BFD packets use IP/UDP encapsulation (with IP/UDP
•
headers).
Raw-BFD—Uses BFD to verify PW connectivity. BFD packets use PW-ACH encapsulation (without
•
IP/UDP headers). Raw-BFD takes effect only when the CC type is control-word.

Configuring MPLS ping for a PW

Before you configure MPLS ping for a PW, complete the following tasks:
1. Create a PW class, and use the vccv cc command to configure the VCCV CC type in PW class
view.
2. Create the PW, and reference the PW class created in the previous step for the PW.
Perform the following task in any view:
Task
Use MPLS ping to verify the
connectivity of a PW.

Configuring BFD for a PW

Follow these steps to configure BFD for a PW:
1. Enable MPLS BFD.
2. Create a PW class, and configure BFD for PW connectivity verification in PW class view.
3. Create the PW, and reference the PW class created in the previous step for the PW.
Whether BFD is used to verify PW connectivity, which encapsulation type is used for the BFD packets,
and which CC type is used are determined by the configurations on both ends of the PW.
• If both PEs of the PW have configured BFD for the PW and use the same BFD packet encapsulation
type, the PEs use the specified encapsulation type to verify the PW connectivity. Otherwise, the PEs
do not use BFD to verify the PW connectivity.
If both PEs have specified the same VCCV CC type, the specified VCCV CC type is used. Otherwise,
•
the PEs do not use any CC and they cannot establish a BFD session for the PW.
Perform this task to use BFD to verify the connectivity of a static PW or an LDP PW of MPLS L2VPN:
Command
ping mpls [ -a source-ip | -c count | -exp exp-value | -h ttl-value | -m
wait-time | -r reply-mode | -rtos tos-value | -s packet-size | -t time-out |
-v ] * pw ip-address pw-id pw-id
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