3Com MSR 50 Series Configuration Manual page 1364

1364 C 77: MPLS TE C
HAPTER
n
c
ONFIGURATION
To do...
Configure the TLV type
of the sub-TLV carrying
DS-TE parameters
For more information about IS-IS, refer to
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IS-IS TE does not support advertisement of secondary IP addresses. With IS-IS
■
TE enabled on an interface configured with multiple IP addresses, IS-IS TE
advertises only the primary IP address of the interface in its LSP IS reachability
TLV (22). IS-IS TE is not recommended on an interface configured with
secondary IP addresses.
Configuring an MPLS TE explicit path
An explicit path is a set of nodes. The relationship between any two neighboring
nodes on an explicit path can be either of the following:
Strict: where the two nodes are directly connected.
■
Loose: where the two nodes have devices in between.
■
When inserting nodes to an explicit path or modifying nodes on it, you may
configure the include keyword to have the established LSP traverse the specified
nodes or the exclude keyword to have the established LSP bypass the specified
nodes.
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
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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.
In a word, with the TE feature, the MTU of any interface with IS-IS enabled is
recommended to be equal to or greater than 512 octets to guarantee that IS-IS
LSPs can be flooded on the network.
Follow these steps to configure an MPLS TE explicit path:
To do...
Enter system view
Create an explicit path for
MPLS TE tunneling and enter
its view
Use command to...
te-set-subtlv { bw-constraint
value | lo-multiplier value |
unreserved-bw-sub-pool value }
Use command to...
system-view
explicit-path path-name
[ enable | disable ]
Remarks
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.
"IS-IS Configuration" on page
Remarks
--
Required
877.