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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 7 Configuring Virtual Connections
Configuring Backup Addresses for Soft PVC and Soft PVP Connections
To check what NSAP addresses are advertised, use the show atm route command, as in the following
example on Switch-C.
Switch-C# show atm route
Codes: P - installing Protocol (S - Static, P - PNNI, R - Routing control),
T - Type (I - Internal prefix, E - Exterior prefix, SE -
Summary Exterior prefix, SI - Summary Internal prefix,
ZE - Suppress Summary Exterior, ZI - Suppress Summary
Internal)
P T Node/Port St Lev Prefix
~ ~~ ~~~~~~~~~~~~~~~~ ~~ ~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
P I 12 0 UP 0 47.0079.0000.0000.0000.0000.0000.00a0.3e00.0001/152
P I 12 0 UP 0 47.0091.8100.0000.0060.3e5a.4500/104
P SI 1 0 UP 0 47.0091.8100.0000.0060.3e5a.4501/104
P I 9 0 UP 0 47.0091.8100.1111.1111.1111.1111.1111.1111.1111/152
P E 10 0 UP 0 47.0091.8100.1111.1111.1111.1111.1111.1111.1111/152
P I 10 0 UP 0 47.0091.8100.1111.1111.1111.2222.2222.2222.2222/152
If the active and standby interfaces are on different switches and configured with the same NSAP
address, two entries appear in the ATM routing tables of all the nodes in the PNNI network. One entry
with the 19-byte prefix is internal and another prefix entry is exterior, as show in the previous show atm
route command example. A PNNI internal prefix has higher precedence than an exterior prefix.
Whenever the switch needs to route a soft PVC or soft PVP for a particular NSAP address (associated
using the soft redundancy group command) and if there are two entries of same prefix (one is internal
and the other is exterior), the switch routes the call to the node that advertises the internal prefix.
Note To display the PNNI precedence configuration use the show atm pnni precedence command.
Following are the details of how the prefixes of ATM NSAP addresses of the active and standby
interfaces are advertised through PNNI (in this case the active and standby interfaces are on different
switches):
1. The switch, having the interface configured as active, advertises the 19-byte prefix of that NSAP
address as an internal prefix.
2. The switch, having the interface configured as standby, advertises the 19-byte prefix of that NSAP
address as an exterior prefix.
Figure 7-10 shows a DSLAM with a call setup to the ATM PNNI network and two Catalyst 8540 MSR
switches connected to the ATM PNNI network with redundant soft VC destinations on the C8540-1 and
C8540-2 switches:
• DSLAM has call setup to NSAP address—
47.0091.8100.1111.1111.1111.1111.1111.1111.1111.00
• Redundant active ATM interface ATM 1/1/0 NSAP address on C8540-1—
47.0091.8100.1111.1111.1111.1111.1111.1111.1111.00
• Redundant standby ATM interface ATM 1/1/0 NSAP address on C8540-2—
47.0091.8100.1111.1111.1111.1111.1111.1111.1111.00