H3C SR8800 10G Mpls Configuration Manual page 73

Step
6. Return to OSPF view.
NOTE:
For more information about OSPF opaque LSA, see
•
• MPLS TE cannot reserve resources and distribute labels on OSPF virtual links. MPLS TE cannot establish
an LSP tunnel through an OSPF virtual link. Make sure no virtual links exist in the OSPF routing domain
when configuring OSPF TE.
Configuring IS-IS TE
Configure IS-IS TE if the routing protocol is IS-IS and a dynamic signaling protocol is used for MPLS TE
tunnel setup. In case both OSPF TE and IS-IS TE are available, OSPF TE takes priority.
The IS-IS TE extension uses the sub-TLV of IS reachability TLV (type 22) to carry TE attributes. Before
configuring IS-IS TE, you need to configure the IS-IS wide metric style, which can be wide, compatible, or
wide-compatible.
CAUTION:
According to RFC 3784, the length of the IS reachability TLV (type 22) may reach the maximum of 255
•
octets in some cases.
• For an IS-IS LSP to carry this type of TLV and to be flooded normally on all interfaces with IS-IS enabled,
the MTU of any IS-IS enabled interface, including 27 octets of LSP header and two octets of TLV header,
cannot be less than 284 octets. If an LSP must also carry the authentication information, the minimum
MTU needs to be recalculated according to the packet structure.
When TE is configured, H3C recommends that you set the MTU of any interface with IS-IS enabled be
equal to or greater than 512 octets to guarantee that IS-IS LSPs can be flooded on the network.
To configure IS-IS TE:
Step
1. Enter system view.
2. Enter IS-IS view.
3. Configure the wide metric
attribute of IS-IS.
4. Enable IS-IS TE.
5. Configure the TLV type of the
sub-TLV carrying DS-TE
parameters.
Command
quit
Layer 3—IP Routing Configuration Guide
Command
system-view
isis [ process-id ]
cost-style { narrow | wide |
wide-compatible | { compatible |
narrow-compatible }
[ relax-spf-limit ] }
traffic-eng [ level-1 | level-2 |
level-1-2 ]
te-set-subtlv { bw-constraint value
| lo-multiplier value |
unreserved-bw-sub-pool value }
62
Remarks
N/A
Remarks
––
––
By default, IS-IS uses narrow metric
style.
Disabled by default.
Optional.
By default, the bw-constraint
parameter is carried in sub-TLV
252; the lo-multiplier parameter in
sub-TLV 253; and the
unreserved-bw-sub-pool
parameter in sub-TLV 251.
.