Routing Using Lsps; Routing Using Direct And Indirect Lsps - Extreme Networks BlackDiamond 6800 MPLS Installation And User Manual

MPLS and IP Routing

Routing Using LSPs

This section describes the following topics:
• Routing Using Direct and Indirect LSPs on page 6-2
• LSP Precedence and Interaction on page 6-4
• Equal Cost LSPs on page 6-4
• Overriding IBGP Metrics for RSVP-TE LSPs on page 6-5

Routing Using Direct and Indirect LSPs

Using MPLS, two types of LSPs can be used to route a packet to its destination:
• Direct LSP
An LSP is considered direct with respect to an FEC if it has been associated with the
FEC via LDP or RSVP-TE.
• Indirect LSP
An LSP is considered indirect with respect to an FEC if it has been associated with
the FEC via a routing protocol.
Figure 6-1 illustrates the concept of direct and indirect LSPs.
LSR A
Router ID
10.3.1.1
Direct
LSPs
Figure 6-1: Direct and indirect LSPs
6-2
LSR B
Router ID
10.2.1.1
Subnet
30
31
32
33
34
Bound labels
for LSR A
LSR C
Router ID
10.1.1.1
Subnet
MPLS Module Installation and User Guide
10.0.1.0/24
10.0.2.0/24
10.0.3.0/24
MPLS_17