Configuring Cr-Lsp Backup; Configuring Frr - 3Com S7906E Configuration Manual

Configuring CR-LSP Backup

CR-LSP backup provides end-to-end path protection to protect the entire LSP.
Configuration Prerequisites
Before configuring CR-LSP backup, do the following:
Configure MPLS basic capabilities
Configure MPLS TE basic capabilities
Configure MPLS TE tunnels
Configuration Procedure
Follow these steps to configure CR-LSP backup:
To do...
Enter system view of the
ingress node
Enter MPLS TE tunnel interface
view
Configure the backup mode
used by the TE tunnel
Submit current tunnel
configuration
CR-LSP backup should be configured at the ingress node of a tunnel. The system routes the primary
LSP and backup LSP automatically. You do not need to configure them.

Configuring FRR

As mentioned earlier, Fast Reroute (FRR) provides quick but temporary per-link or per-node local
protection on an LSP.
FRR uses bypass tunnels to protect primary tunnels. As bypass tunnels are pre-established, they
require extra bandwidth and are usually used to protect crucial interfaces or links only.
You can define which type of LSP can use bypass LSPs, and whether a bypass LSP provides
bandwidth protection as well as the sum of protected bandwidth.
The bandwidth of a bypass LSP is to protect its primary LSPs. To guarantee that a primary LSP can
always bind with the bypass LSP successfully, make sure that the bandwidth assigned to the bypass
LSP is not less than the total bandwidth needed by all protected LSPs.
Normally, bypass tunnels only forward data traffic when protected primary tunnels fail. To allow a
bypass tunnel forward data traffic while protecting the primary tunnel, you need to ensure that bypass
tunnels are available with adequate bandwidth.
Use the command...
system-view
interface tunnel
tunnel-number
mpls te backup { hot-standby
| ordinary }
mpls te commit
1-34
Remarks
––
––
Required
Tunnel backup is disabled by
default.
Required