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Configuring IS-IS TE
IS-IS TE uses a sub-TLV of the extended IS reachability TLV (type 22) to carry TE attributes.
Because the extended IS reachability TLV carries wide metrics, specify a wide metric-compatible
metric style for the IS-IS process before enabling IS-IS TE. Available metric styles for IS-IS TE
include wide, compatible, or wide-compatible. For more information about IS-IS, see Layer 3—IP
Routing Configuration Guide.
Because of the following conditions, specify an MTU that is equal to or greater than 512 bytes on
each IS-IS enabled interface for IS-IS LSPs to be flooded on the network:
•
The length of the extended IS reachability TLV might reach the maximum of 255 bytes.
•
The LSP header takes 27 bytes and the TLV header takes two bytes.
•
The LSP might also carry the authentication information.
To configure IS-IS TE:
Step
1.
Enter system view.
2.
Create an IS-IS process
and enter IS-IS view.
3.
Specify a metric style.
4.
Enable MPLS TE for the
IS-IS process.
5.
Specify the types of the
sub-TLVs for carrying
DS-TE parameters.
Configuring MPLS TE tunnel constraints
Perform this task on the ingress node of the MPLS TE tunnel.
Configuring bandwidth constraints for an MPLS TE tunnel
Step
1.
Enter system view.
2.
Enter MPLS TE tunnel
interface view.
3.
Configure bandwidth
required for the tunnel, and
specify a CT for the tunnel's
traffic.
Configuring the affinity attribute for an MPLS TE tunnel
The associations between the link attribute and the affinity attribute might vary by vendor. To ensure
the successful establishment of a tunnel between two devices from different vendors, correctly
configure their respective link attribute and affinity attribute.
Command
system-view
isis [ process-id ]
cost-style { narrow | wide |
wide-compatible | { compatible
| narrow-compatible }
[ relax-spf-limit ] }
mpls te enable [ Level-1 |
Level-2 ]
te-subtlv { bw-constraint value |
unreserved-subpool-bw value }
*
Command
system-view
interface tunnel tunnel-number
[ mode mpls-te ]
mpls te bandwidth [ ct0 | ct1 |
ct2 | ct3 ] bandwidth
87
Remarks
N/A
By default, no IS-IS process exists.
By default, only narrow metric style
packets can be received and sent.
For more information about this
command, see Layer 3—IP Routing
Command Reference.
By default, an IS-IS process does
not support MPLS TE.
By default, the bw-constraint
parameter is carried in sub-TLV
252, and the
unreserved-bw-sub-pool
parameter is carried in sub-TLV
251.
Remarks
N/A
N/A
By default, no bandwidth is
assigned, and the class type is CT
0.
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