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17-30 Riverstone Networks RS Switch Router User Guide Release 8.0
Configuring L3 Label Switched Paths MPLS Configuration
At router R2, packets arriving on interface MPLS-R2IN that are labeled ‘50’ are assigned the label ‘100’ and
forwarded to the next-hop router (R3) at 20.1.1.2. Note the
mpls set interface
command in the following
configuration for R2:
Router R3 is the egress label edge router in the path. At the egress router, the label is stripped off before the packet is
forwarded to its next destination. At router R3, the packets arriving on interface MPLS-R3IN that are labeled ‘100’
will have the label stripped off before the packets are sent to the next-hop. Router R3 has the following configuration:
In the above example, a policy is defined at the ingress router (R1) to filter traffic that is directed onto the static path.
There are other ways that you can send traffic on a path, including IGP shortcuts. (See Section 17.7.3, "IGP
Shortcuts.")
You can use the
mpls show static-paths
command to display the MPLS static path information. On router R1,
the following is displayed for the configured static path:
! Create the MPLS interfaces on this router
interface create ip MPLS-R2IN address-netmask 10.1.1.1/16 port. gi.1.1
interface create ip MPLS-R2OUT address-netmask 20.1.1.1/16 port gi.1.2
! Enable MPLS on the router interfaces
mpls add interface MPLS-R2IN
mpls add interface MPLS-R2OUT
! Configure swapping of labels and next-hop
mpls set interface MPLS-R2IN label-map 50 pop next-hop 20.1.1.2
! Enable MPLS on this router
mpls start
! Create the MPLS interfaces on this router
interface create ip MPLS-R3IN address-netmask 20.1.1.1/16 port. gi.1.1
interface create ip MPLS-R3OUT address-netmask 30.1.1.1/16 port gi.1.2
! Enable MPLS on the router interfaces
mpls add interface MPLS-R3IN
mpls add interface MPLS-R3OUT
! Enable MPLS on this router
mpls start
R1#
mpls show static-paths all
Ingress LSP:
LSPname To From State LabelIn LabelOut
SP1 50.1.1.1 7.7.7.7 Up - 50