Samsung Ubigate iBG3026, Configuration Manual

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CHAPTER 18. MPLS
158
© SAMSUNG Electronics Co., Ltd.
Establishing a Trunk-Using Explicitly Defined Path
The Explicit Route hops can be configured explicitly in the trunk
configuration. In this case, the RSVP daemon uses the configured hops as
ERO. It sets up the LSP using specified hops only. For a detailed description
of the path parameters refer to the
RSVP-TE Command Reference.
Explicitly specified hops can also be used when CSPF is enabled. In this case,
CSPF uses the specified hops as constraints while computing the Explicit
Route to be sent to the RSVP daemon.
As ERO is composed of IP addresses called hops. An ERO hop can be defined
as loose or strict. A loose hop can be reached by any available route. Whereas,
a strict hop must be reached via a direct link and cannot be routed over any
alternate routers in between.
In this example, since R1 is defined as loose hop, R2 can use R4 as an
intermediate hop to reach R3. However, if it was strict then R2 would have to
use interface Ethernet 1/1 to reach R3 directly.
Figure 18.7 Explicitily Defined Path
R1-RSVP-TE
Router#configure terminal
Router/configure# rsvp-path P1
Router/configure/rsvp-path# hop-address 10.10.23.60
Router/configure/rsvp-path# hop-address 10.10.21.90
Router/configure/rsvp-path# exit
Router/configure# rsvp-trunk T1
Router/configure# primary no-cspf
lo
192.168.0.63
eth 2/1
192.168.0.60
192.168.0.90
eth 0/0
R1
R2
eth 1/1
10.10.23.0/24 10.10.21.0/24
eth 0/1
lo
lo
eth 2/1 eth 1/1
eth 2/1
R2
R3
eth 1/1
10.10.24.0/24
10.10.12.0/24