Configuring A Bypass Tunnel On The Plr - HP MSR2000 Configuration Manual

Step
3. Enable FRR.

Configuring a bypass tunnel on the PLR

Overview
To configure FRR, you must configure bypass tunnels for primary CRLSPs on the PLR.
To configure bypass tunnels on the PLR, you can use the following methods:
• Manually configuring a bypass tunnel on the PLR—Create an MPLS TE tunnel on the PLR, and
configure the tunnel as a bypass tunnel for a primary CRLSP. You need to specify the bandwidth and
CT that the bypass tunnel can protect, and bind the bypass tunnel to the egress interface of the
primary CRLSP.
You can configure up to three bypass tunnels for a primary CRLSP.
Configuring the PLR to set up bypass tunnels automatically—Configure the automatic bypass tunnel
•
setup function (also referred to as the auto FRR function) on the PLR. The PLR automatically sets up
two bypass tunnels for each of its primary CRLSPs: one in link protection mode and the other in
node protection mode. Automatically created bypass tunnels can be used to protect any type of CT,
but they cannot provide bandwidth protection.
A primary tunnel can have both manually configured and automatically created bypass tunnels. The PLR
will select one bypass tunnel to protect the primary CRLSP. The selected bypass tunnel is bound to the
primary CRLSP.
Manually created bypass tunnels take precedence over automatically created bypass tunnels. An
automatically created bypass tunnel in node protection mode takes precedence over an automatically
created bypass tunnel in link protection mode. Among manually created bypass tunnels, the PLR selects
the bypass tunnel for protecting the primary CRLSP by following these rules:
1. Selects a bypass tunnel according to the principles, as shown in
2. Prefers the bypass tunnel in node protection mode over the one in link protection mode.
3. Prefers the bypass tunnel with a smaller ID over the one with a bigger tunnel ID.
Table 2 FRR protection principles
Bandwidth
required by
primary
CRLSP
0
Command
mpls te fast-reroute [ bandwidth ]
Primary CRLSP
requires Bypass tunnel providing
bandwidth bandwidth protection
protection or not
The primary CRLSP cannot be
Yes
bound to the bypass tunnel.
82
Remarks
By default, FRR is disabled.
If you specify the bandwidth
keyword, the primary CRLSP must
have bandwidth protection.
Table 2.
Bypass tunnel providing no
bandwidth protection
The primary CRLSP can be bound to
the bypass tunnel if CT 0 or no CT is
specified for the bypass tunnel.
After binding, the RRO message
does not carry the bandwidth
protection flag. The bypass tunnel
does not provide bandwidth