HP MSR2000/3000/4000 Router Series MPLS Configuration Guide
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• Usually, a bypass tunnel does not forward data when the primary CRLSP works. For a bypass tunnel
to also forward data during tunnel protection, you must assign adequate bandwidth to the bypass
tunnel.
• A bypass tunnel cannot be used for services like VPN.
Enabling FRR
Perform this task on the ingress node of a primary CRLSP.
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter tunnel interface view of
the primary CRLSP.
interface tunnel tunnel-number
[ mode mpls-te ]
N/A
3. Enable FRR.
mpls te fast-reroute By default, FRR is disabled.
Configuring a bypass tunnel on the PLR
To configure FRR, you must create an MPLS TE tunnel on the PLR, specify the bandwidth and CRLSP types
that the tunnel can protect, and bind the tunnel to the egress interface of the primary CRLSP. This MPLS
TE tunnel serves as the bypass tunnel of the primary CRLSP. When the link or node connected to the
egress interface fails, MPLS TE switches the traffic to the bypass tunnel to ensure uninterrupted traffic
forwarding.
The bypass tunnel setup method is the same as a normal MPLS TE tunnel. This section describes only
FRR-related configurations.
When configuring a bypass tunnel, follow these guidelines:
• You cannot configure FRR for a bypass tunnel. A bypass tunnel cannot act as a primary CRLSP.
• The protected interface cannot be the egress interface of the bypass tunnel.
• You can specify up to three bypass tunnels for a protected interface. If multiple bypass tunnels are
specified, the one that can provide node protection is preferred.
• Make sure the bandwidth assigned to the bypass tunnel is no less than the total bandwidth needed
by all primary CRLSPs. Otherwise, some primary CRLSPs might not be protected by the bypass
tunnel.
To configure a bypass tunnel on the PLR:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter tunnel interface view of
the bypass tunnel.
interface tunnel tunnel-number
[ mode mpls-te ]
N/A
3. Specify the destination
address of the bypass tunnel.
destination ip-address
The bypass tunnel destination
address is the LSR ID of the MP.