92
To enable FRR:
Step 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
[
bandwidth
]
By default, FRR is disabled.
If you specify the
bandwidth
keyword, the primary CRLSP
must have bandwidth protection.
193B
Configuring a bypass tunnel on the PLR
396B
Overview
To configure FRR, you must configure bypass tunnels for primary CRLSPs on the PLR by using 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 output
interface of the primary CRLSP.
You can configure a maximum of three bypass tunnels for a primary CRLSP.
•
Configuring the PLR to set up bypass tunnels automatically
—Configure the automatic
bypass tunnel setup feature (also referred to as the auto FRR feature) 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
740H
Table 2
.
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
Bandwidt
h required
by
primary
CRLSP
Primary
CRLSP
requires
bandwidth
protection or
not
Bypass tunnel providing
bandwidth protection
Bypass tunnel providing no
bandwidth protection
0
Yes
The primary CRLSP cannot be
bound to the bypass tunnel.
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
No