Port cross-connect (PXC)

For information about PXC, see the "Interfaces" chapter of the 7450 ESS, 7750 SR, 7950 XRS, and VSR Interface Configuration Guide.

Figure: In-band management using a VPRN service and PXC shows an example of the operation of in-band management using a VPRN and PXC.

The CLI example below shows the configuration of the PXC based on the example shown in Figure: In-band management using a VPRN service and PXC.

Example:

A:DUT>config>port 1/2/6 shutdown
A:DUT>config>port-xc
A:DUT>config>port-xc# pxc 1 create
A:DUT>config>port-xc>pxc# port 1/2/6
A:DUT>config>port-xc>pxc# no shutdown
A:DUT>config>port-xc>pxc# exit all
A:DUT>>configure
A:DUT>>config# port pxc-1.a no shutdown
A:DUT>>config# port pxc-1.b no shutdown
A:DUT>>config# port 1/2/6 no shutdown

To ensure management traffic from the CPM can reach the NSP NFM-P over the VPRN, an interface in the Global Routing Table (GRT) is configured on one of the PXC ports. In the example shown in Figure: In-band management using a VPRN service and PXC, the GRT PXC port is port pxc-1.b. This port is looped internally together with PXC port pxc-1.a, the SAP of the in-band management VPRN. A router interface is required on port pxc-1.b:1 (VLAN 1) and used to route management traffic from the CPM toward the in-band management VPRN. A static route is configured in the GRT for the NSP NFM-P address, 1.1.1.1, with a next hop of the VPRN SAP, or port pxc-1.a:1. The CLI output below shows configuration examples in the GRT.

*A:DUT>config>service>vprn# info
----------------------------------------------
    interface "pxc"
        address 192.168.255.0/31
        port pxc-1.b:1
        no shutdown
    exit
...
    static-route-entry 1.1.1.1/24
        next-hop 192.168.255.1
            no shutdown
        exit
    exit
...
----------------------------------------------
*A:DUT>config>router#

A SAP interface on the other PXC port is required by the in-band management VPRN to route management traffic toward the CPM. A static route is configured in the VPRN for the CPM system IP address 10.10.10.1, with a next hop of the GRT interface port pxc-1.b:1. The CLI output below shows configuration examples for the VPRN.

*A:ALU-1>config>service# info
----------------------------------------------
...
    vprn 1 customer 1 create
        autonomous-system 65200
        route-distinguisher 65200:1
        auto-bind-tunnel
            resolution-filter
                gre
                exit
            exit
        vrf-target target:65200:1
        interface "pxc" create
                address 192.168.255.1/31
                sap pxc-1.a:1 create
                exit
        exit
        static-route-entry 10.10.10.1/32 next-hop 192.168.255.0
        no shutdown
    exit
...