Specifications

show ip traffic-engineering
MP-543
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
show ip traffic-engineering
To display information about the traffic engineering configuration and metric information associated
with it, use the show ip traffic-engineering command in privileged EXEC mode.
show ip traffic-engineering [me
trics [detail]]
Syntax Description
Command Modes Privileged EXEC
Command History
Usage Guidelines The goal of the loop prevention algorithm is that traffic should not be sent down the tunnel if there is a
p
ossibility that, after leaving the tunnel, steady state routing will route the traffic back to the head of the
tunnel.
The strategy of the loop prevention algorithm is to compare the Layer 3 routing distance to the egress
f
rom the tunnel tailend and tunnel headend. The loop check passes only if the tunnel tail is closer to the
egress than the tunnel head is.
The loop prevention algorithm allows you to use the tunnel for a route if one the following cases applies:
• Given that the two ends of the tunnel are routing to the egress using the same dynamic protocol in
the same area, the Layer 3 routing distance from the tailend to the egress is less than the Layer 3
ro
uting distance from the headend to the egress.
• The route to the egress is directly connected at the tunnel tailend router, but not at the tunnel headend
router.
• The egress is unreachable from the tunnel headend router, but is reachable from the tunnel tailend
router.
The loop prevention algorithm prevents you from using the tunnel for a given egress in all other cases,
in
particular, the following cases:
• The routers at the ends of the tunnel get their route to the egress from different dynamic routing
protocols.
• The routing protocols at the two ends of the tunnel route to the egress through different areas.
• The two ends each use a static route to the egress.
metrics (Optional) Displays metric information associated with traffic engineering.
detail (Optional) Displays information in long form.
Release Modification
11.1CT This command was introduced.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support
i
n a specific 12.2SX release of this train depends on your feature set,
platform, and platform hardware.