Configuring Cr-Lsp Backup; Configuration Prerequisites; Configuration Procedure - 3Com MSR 50 Series Configuration Manual

1380 C 77: MPLS TE C
HAPTER
Configuring CR-LSP
Backup
Configuration
Prerequisites

Configuration Procedure

ONFIGURATION
To do...
Configure automatic
bandwidth adjustment for the
TE tunnel
Configure the interval for
polling the output rate of the
TE tunnel
Submit current tunnel
configuration
The sampling interval configured in MPLS view applies to all MPLS TE tunnels. The
output rates of all MPLS TE tunnels are recorded every sampling interval to
calculate the actual average bandwidth of an MPLS TE tunnel in one sampling
interval.
Once the mpls te auto-bandwidth adjustment frequency command you
configured in MPLS TE tunnel interface view takes effect, an adjustment frequency
timer starts. Upon expiration of this timer, MPLS TE resizes the tunnel bandwidth
using the maximum tunnel output rate sampled before the expiration of the timer
as the bandwidth constraint to set up a new LSP tunnel. If the setup attempt
succeeds, traffic will be switched to the new LSP tunnel and the old LSP tunnel will
be cleared. If the setup attempt fails, traffic travels the existing LSP tunnel.
CR-LSP backup provides end-to-end path protection to protect the entire LSP.
Before configuring CR-LSP backup, do the following:
Configure MPLS basic capabilities
■
Configure MPLS TE basic capabilities
■
Configure MPLS TE tunnels
■
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
Use command to...
mpls te auto-bandwidth
adjustment [ frequency
seconds ] [ max-bw
max-bandwidth | min-bw
min-bandwidth ]*
mpls te auto-bandwidth
collect-bw [ frequency
seconds ] [ max-bw
max-bandwidth | min-bw
min-bandwidth ]*
mpls te commit
Use command to...
system-view
interface tunnel
tunnel-number
mpls te backup
{ hot-standby | ordinary }
mpls te commit
Remarks
Required
Automatic bandwidth
adjustment is disabled on TE
tunnels by default.
Required
Output rate polling is disabled
on TE tunnels by default.
Required
Remarks
--
--
Required
Tunnel backup is disabled by
default.
Required