Connecting the MGX-Based PoP with the BPX-Based PoP | Cisco Multiservice Switching Networks

Finally, we will add an MPLS link between the MGX-8850 and the BPX-8600. We will add a virtual link over a VP to cover all the options.

On the BPX side, we up a virtual trunk (in this case using uptrk 13.4.1), configure the trunk for a null stats reserve, and configure resources on the virtual trunk. On the external LSC, we bind these resources to an XTagATM interface. See Example 6-69.

Example 6-69. Configuring an LC-ATM for a Virtual Trunk

 P1_LSC_c7204#conf t Enter configuration commands, one per line.  End with CNTL/Z. P1_LSC_c7204(config)#interface xTagATM 1341 P1_LSC_c7204(config-if)#ip unnumbered loopback 0 P1_LSC_c7204(config-if)#mpls ip P1_LSC_c7204(config-if)#extended-port atM 3/0 bpx 13.4.1 P1_LSC_c7204(config-if)#^Z P1_LSC_c7204#

On the MGX side, we start by configuring the AXSM card. We up a line and up a port. That port is a VNNI port using VPI = 27 (see Example 6-70). It is important to match all line parameters such as framing, scrambling, and so on.

Example 6-70. Configuring an AXSM Port

 P3-m8850.1.AXSM.a > addport 40 1.4 10000 10000 4 3 27 P3-m8850.1.AXSM.a > dspports ifNum Line Admin Oper. Guaranteed Maximum     Port SCT Id     ifType  VPI            State State Rate       Rate                               (VNNI only) ----- ---- ----- ----- ---------- --------- ----------------- ------ ----------     1  1.1    Up    Up      96000     96000   4                   UNI    0    40  1.4    Up    Up      10000     10000   4                  VNNI   27 P3-m8850.1.AXSM.a >

We now add a resource partition (see Example 6-71).

Example 6-71. Adding a VSI Resource Partition in an AXSM Port

 P3-m8850.1.AXSM.a > addpart 40 2 3 1000000 1000000 1000000 1000000 27 27 1 65535   512 1024 P3-m8850.1.AXSM.a > dspparts if  part Ctlr egr     egr     ingr    ingr    min max   min   max  min   max Num ID   ID   GuarBw  MaxBw   GuarBw  MaxBw   vpi vpi   vci   vci  conn  conn              (.0001%)(.0001%)(.0001%)(.0001%) -----------------------------------------------------------------------------  1   2    3 1000000 1000000 1000000 1000000    0  255     1 65535    512   1024 40   2    3 1000000 1000000 1000000 1000000   27   27     1 65535    512   1024 P3-m8850.1.AXSM.a >

From the LSC, we now see the partition. Refer to Exampel 6-72.

Example 6-72. Checking the VSI Resource Partition from the LSC

 P3_LSC_m8850_RPM-PR_9(config)#do show controllers vsi descriptor | begin 1.4 Phys desc: 1:1.4:40 Log intf:  0x01011828 Interface: n/a IF status: n/a                   IFC state: ACTIVE Min VPI:   27                    Maximum cell rate:  10000 Max VPI:   27                    Available channels: 1024 Min VCI:   1                     Available cell rate (forward):  10000 Max VCI:   65535                 Available cell rate (backward): 10000

Next we create the XTagATM interface. We use the vsi option of the extended-port command in this case, as shown in Example 6-73. The parameter of the vsi option is the 32-bit LIN in hexadecimal form with a leading 0x. It uniquely identifies the Switch Logical Interface that the XTagATM extends.

Example 6-73. Configuring an LC-ATM Using the LIN

 P3_LSC_m8850_RPM-PR_9(config)#interface xtagatm 1144 P3_LSC_m8850_RPM-PR_9(config-if)#mpls ip P3_LSC_m8850_RPM-PR_9(config-if)#ip unnumbered loopback 0 P3_LSC_m8850_RPM-PR_9(config-if)#extended-port switch 1 vsi 0x01011828 P3_LSC_m8850_RPM-PR_9(config-if)#^Z P3_LSC_m8850_RPM-PR_9#