H3C Technologies H3C S7500E Series Switches - Manual (Page 119)

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To do… Use the command... Remarks
Enter MPLS TE tunnel interface
view
interface tunnel tunnel-number ––
Configure the backup mode used
by the TE tunnel
mpls te backup { hot-standby |
ordinary }
Required
Tunnel backup is disabled by
default.
Submit current tunnel
configuration
mpls te commit Required
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
Only EA, EB and SD cards support 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.
A bypass tunnel cannot be used for services like VPN at the same time.
Configuration Prerequisites
Before configuring FRR, do the following:
z
Configure IGP, ensuring that all LSRs are reachable