4-16
Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter4 Planning for Card Redundancy, Line Redundancy, and Bulk Distribution
Planning for Standalone and Redundant Line Configurations
Figure 4-8 shows how a standalone AXSM connects to redundant lines.
Figure4-8 Standalone AXSM with Intracard APS
Because the front cards are far more complex and expensive than the back cards, intracard APS is not
practical for most 1:1 redundant card installations. The use of i ntracard APS for most service modules
cuts the available port count in half.
The exception to the above rule is the VXSM-4-155, which uses two 4-port back car ds to double its port
count. When intracard APS is used with VXSM-4-155, all four por ts can be configured for intracard APS
without cutting the port count. Figure4-9 shows how a standalone VXSM connects to redundant lines.
Figure4-9 Standalone VXSM with Intracard APS
When planning an intracard APS configuration, consider the following requirem ents:
•Not all cards support intracard APS. Table 4 -1 lists all the card types and specifies which cards
support intracard APS.
•For all cards except VXSM-4-155, the working line and the protection line must connect to adjacent
ports on the same back card.
AXSM front card AXSM back cards
Working line B
45055
Midplane
Protection line B
Working line A
Protection line A
VXSM front card VXSM back cards
Protection line A
116508
Midplane
Protection line B
Working line A
Working line B