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MPLS Module Installation and User Guide 5-19

Configuring RSVP-TE

Configuring an Explicit Route

To add an RSVP-TE explicit route, use the following command:

config mpls rsvp-te path <path_name> add ero [ipaddress

<ipaddress/masklength> | <host_name>] {strict | loose} {order <number>}

This command adds an IP address to the explicit route object (ERO) for the specified

path name. The RSVP-TE routed path may be described by a configured sequence of the

LSRs and/or subnets traversed by the path. Each defined LSR or subnet represents an

ERO subobject. Up to 64 subobjects can be added to each path name.

When specifying an LSR using the

<host_name>

parameter, the DNS client on the

switch must be configured so that the

<host_name>

can first be resolved to an IP

address. The

ipaddress

keyword identifies an LSR using either a /32 address, which

may represent an LSR router ID, loopback address, or direct router interface, or an IP

prefix, which represents a directly connected subnet. Each IP address or prefix is

included in the ERO as an IPv4 subobject. Each specified subobject must be

topologically adjacent to the next subobject, as listed in the ERO. If the subobject

matches a direct router interface or a directly attached subnet, the switch verifies that

the path message is received on the matching router interface. If the LSR specified

matches the OSPF router ID or a configured loopback IP address, the router interface on

which the packet is received is ignored.

If the IP address is specified as

strict

, the strict subobject must be topologically

adjacent to the previous subobject as listed in the ERO. If the IP address is specified as

loose

, the loose subobject is not required to be topologically adjacent to the previous

subobject as listed in the ERO. If omitted, the default subobject attribute is

strict

. Each

IP address or prefix is included in the ERO as an IPv4 subobject.

If the subobject matches a direct router interface or a directly attached subnet, the

switch verifies that the path message is received on the matching router interface. If the

LSR specified matches the OSPF router ID or a configured loopback IP address, the

router interface which the packet is received is ignored.

The LSR path order is optionally specified using the

order

keyword. The

order

number

parameter is an integer value from 1 to 65535. IP prefixes with a lower number

are sequenced before IP prefixes with a higher number. You can specify multiple paths

and assign them an order number. The order number determines the path that the LSP

The LSP next hop matches either the interface IP address or the OSPF router-id

of the immediate neighbor LSR.

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