Mpls Te Forwarding Adjacency; Tune Adjacencies For Is-Is - Cisco NCS 5500 Series Configuration Manuals

Implementing IS-IS
(Optional) Displays MPLS TE tunnel information.
Step 9
show isis [ instance instance-id ] mpls traffic-eng adjacency-log
Example:
RP/0/RP0/CPU0:router# show isis instance isp mpls traffic-eng adjacency-log
(Optional) Displays a log of MPLS TE IS-IS adjacency changes.
Step 10
show isis [ instance instance-id ] mpls traffic-eng advertisements
Example:
RP/0/RP0/CPU0:router# show isis instance isp mpls traffic-eng advertisements
(Optional) Displays the latest flooded record from MPLS TE.

MPLS TE Forwarding Adjacency

MPLS TE forwarding adjacency allows a network administrator to handle a traffic engineering, label switch
path (LSP) tunnel as a link in an Interior Gateway Protocol (IGP) network, based on the Shortest Path First
(SPF) algorithm. A forwarding adjacency can be created between routers in the same IS-IS level. The routers
can be located multiple hops from each other. As a result, a TE tunnel is advertised as a link in an IGP network,
with the cost of the link associated with it. Routers outside of the TE domain see the TE tunnel and use it to
compute the shortest path for routing traffic throughout the network.
MPLS TE forwarding adjacency is considered in IS-IS SPF only if a two-way connectivity check is achieved.
This is possible if the forwarding adjacency is bidirectional or the head end and tail end routers of the MPLS
TE tunnel are adjacent.
The MPLS TE forwarding adjacency feature is supported by IS-IS. For details on configuring MPLS TE
forwarding adjacency, see the MPLS Configuration Guide.

Tune Adjacencies for IS-IS

This task explains how to enable logging of adjacency state changes, alter the timers for IS-IS adjacency
packets, and display various aspects of adjacency state. Tuning your IS-IS adjacencies increases network
stability when links are congested. This task is optional.
For point-to-point links, IS-IS sends only a single hello for Level 1 and Level 2, which means that the level
modifiers are meaningless on point-to-point links. To modify hello parameters for a point-to-point interface,
omit the specification of the level options.
The options configurable in the interface submode apply only to that interface. By default, the values are
applied to both Level 1 and Level 2.
The hello-password command can be used to prevent adjacency formation with unauthorized or undesired
routers. This ability is particularly useful on a LAN, where connections to routers with which you have no
desire to establish adjacencies are commonly found.
SUMMARY STEPS
1.
configure
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
MPLS TE Forwarding Adjacency
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