Mpls Traffic Engineering Shared Risk Link Groups - Cisco CRS Configuration Manual

MPLS Traffic Engineering Shared Risk Link Groups

Configure the Point-to-Multipoint Tunnel: Example, on page 363
Configure the Point-to-Multipoint Solution: Example, on page 364
Point-to-Multipoint Traffic-Engineering Overview, on page 193
Point-to-Multipoint RSVP-TE , on page 195
MPLS Traffic Engineering Shared Risk Link Groups
Shared Risk Link Groups (SRLG) in MPLS traffic engineering refer to situations in which links in a network
share a common fiber (or a common physical attribute). These links have a shared risk, and that is when one
link fails, other links in the group might fail too.
OSPF and Intermediate System-to-Intermediate System (IS-IS) flood the SRLG value information (including
other TE link attributes such as bandwidth availability and affinity) using a sub-type length value (sub-TLV),
so that all routers in the network have the SRLG information for each link.
To activate the SRLG feature, configure the SRLG value of each link that has a shared risk with another link.
A maximum of 30 SRLGs per interface is allowed. You can configure this feature on multiple interfaces
including the bundle interface.
Figure 17: Shared Risk Link Group
Figure 17: Shared Risk Link Group
Related Topics
Configuring the SRLG Values of Each Link that has a Shared Risk with Another Link, on page 294
Creating an Explicit Path With Exclude SRLG, on page 296
Using Explicit Path With Exclude SRLG, on page 298
Creating a Link Protection on Backup Tunnel with SRLG Constraint, on page 300
Creating a Node Protection on Backup Tunnel with SRLG Constraint, on page 303
Configure the MPLS-TE Shared Risk Link Groups: Example, on page 353
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
198
illustrates the MPLS TE SRLG values configured on the bundle interface.
Implementing MPLS Traffic Engineering