HP 12500 Series Configuration Manual page 64

The OSPF TE extension uses Opaque Type 10 LSAs to carry TE attributes of links. Before configuring
OSPF TE, you need to enable the opaque capability of OSPF. In addition, for TE LSAs to be generated,
at least one neighbor must be in full state.
To configure OSPF TE:
To do...
Enter system view
Enter OSPF view
Enable the opaque LSA capability
Enter OSPF area view
Enable MPLS TE in the OSPF area
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, configure the IS-IS wide metric style, which can be wide, compatible, or
wide-compatible.
NOTE:
According to RFC 3784, the length of the IS reachability TLV (type 22) may reach the maximum of 255
•
bytes 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 bytes of LSP header and two bytes of TLV header,
cannot be less than 284 bytes. 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, HP recommends that you set the MTU of any interface with IS-IS enabled be equal
to or greater than 512 bytes to guarantee that IS-IS LSPs can be flooded on the network.
To configure IS-IS TE:
To do...
Enter system view
Enter IS-IS view
Use the command...
system-view
ospf [ process-id ]
opaque-capability enable
area area-id
mpls-te enable
quit
Layer 3—IP routing Configuration Guide
Use the command...
system-view
isis [ process-id ]
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Remarks
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Required
Disabled by default
Required
Required
Disabled by default
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Remarks
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