H3C Technologies H3C S6800 Series Switches - Manual (Page 429)

416
• To establish a static BFD session, ensure that the local and remote discriminators configured locally
are identical with the remote and local discriminators configured on the remote device, respectively.
• The source address of the BFD session is the MPLS LSR ID of the local device. Before you configure
BFD for the LSP tunnel, configure an MPLS LSR ID for the local device. Make sure a route is available
on the remote device to reach the MPLS LSR ID.
• On a BFD session established in static mode, the ingress node and egress node both operate in
active mode. On a BFD session established in dynamic mode, the egress node operates in active
mode and the ingress node operates in passive mode. Executing the bfd session init-mode
command on the ingress or egress node does not change the node's operating mode.
• If both BFD and FRR are enabled for an MPLS TE tunnel, set the BFD detection interval for MPLS TE
tunnel connectivity verification to be longer than that for FRR. Otherwise, the BFD session for MPLS
TE tunnel connectivity verification will be down during an FRR switchover.
To configure BFD for MPLS TE tunnels:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable BFD for MPLS. mpls bfd enable
By default, BFD for MPLS is
disabled.
3. Enter the view of the MPLS TE
tunnel interface.
interface tunnel number N/A
4. Configure BFD to verify MPLS
TE tunnel connectivity.
mpls bfd [ discriminator local
local-id remote remote-id ]
[ template template-name ]
By default, BFD is not configured to
verify MPLS TE tunnel connectivity.
Configuring MPLS OAM for a PW
Virtual Circuit Connectivity Verification (VCCV) is an L2VPN PW OAM function to verify PW connectivity
in data plane. VCCV can be implemented in the following modes:
• On-demand mode—Execute the ping mpls pw command to trigger PW connectivity detection.
• Proactive mode—Configure BFD for a PW to test PW connectivity.
The packets used to verify PW connectivity are collectively referred to as VCCV packets. A PE transfers
VCCV packets through a control channel (CC).
The switch supports only the router-alert CC that 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).
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.