Riverstone Networks WICT1-12 - Manual (Page 413)

Riverstone Networks RS Switch Router User Guide Release 8.0 17-105
MPLS Configuration Traffic Engineering
Constrained Path Selection Configuration Example for OSPF Traffic Engineering
The following example illustrates constrained path selection based on an administrative group with OSPF as the IGP.
The same administrative group must be configured on all routers in the LSP. In the example shown in
Figure 17-22 ,
the administrative group ‘SKY’ with a value of 7 is created on all LSRs and applied to the following interfaces: R1R2b
on R1, R2R1b and R2R3 on R2, and R3R2 on R3. An LSP ‘LSP1’ is configured on R1 with R3 as the LSP destination
and SKY as the administrative group. That means that even though there are two possible paths from R1 to R3, CSPF
selects the path that traverses through the interfaces where the administrative group SKY is applied.
Timesaver Click on the router name (in blue) to see the corresponding configuration.
Figure 17-22 Constrained path selection by administrative group
The following is the configuration for R1:
! Create interfaces
interface create ip R1R2 address-netmask 16.128.11.10/24 port gi.4.1
interface create ip R1R2b address-netmask 94.9.9.10/24 port gi.3.1
interface add ip lo0 address-netmask 1.1.1.1/16
! Configure OSPF
ip-router global set router-id 1.1.1.1
ospf create area backbone
ospf add stub-host 1.1.1.1 to-area backbone cost 10
ospf add interface R1R2 to-area backbone
ospf add interface R1R2b to-area backbone
ospf set traffic-engineering on
Enable traffic engineering extensions for OSPF
ospf start
! Create and apply admin-group
mpls create admin-group sky group-value 7
mpls add interface R1R2b
mpls set interface R1R2b admin-group sky
R1
R2 R3
R1R2
R1R2b*
R2R1
R2R1b*
R2R3* R3R2*
Interface where administrative group is applied
CSPF-selected Path
R1R2b*