Cisco Systems OL-7396-01 Manual De Usuario
7-55
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 7
Configuring Virtual Connections
Configuring Backup Addresses for Soft PVC and Soft PVP Connections
Configuring Backup Addresses for Soft PVC and
Soft PVP Connections
Soft PVP Connections
This section describes configuring redundant destinations for soft PVCs and soft PVPs. Redundant
soft PVC and soft PVP destinations allow you to configure the same NSAP address on two different
ATM interfaces. The ATM interfaces can be on the same switch or different switches and use the same
NSAP address in the source-end configuration for the soft PVC or soft PVP. If the active interface fails,
the calls terminating on that interface for the redundant destination address are released and
subsequently reestablished on the standby interface.
soft PVC and soft PVP destinations allow you to configure the same NSAP address on two different
ATM interfaces. The ATM interfaces can be on the same switch or different switches and use the same
NSAP address in the source-end configuration for the soft PVC or soft PVP. If the active interface fails,
the calls terminating on that interface for the redundant destination address are released and
subsequently reestablished on the standby interface.
Additional redundant soft PVC and soft PVP configuration features include:
•
Active and standby modes allow configuring the best destination as active and a standby destination
if the active destination fails.
if the active destination fails.
•
Load balancing of the calls when both interfaces are up and working correctly and when active and
standby interfaces are configured on the same switch.
standby interfaces are configured on the same switch.
Note
Load balancing the redundant soft PVC and soft PVP destinations uses the number of calls received as
the parameter to decide which interface to select.
the parameter to decide which interface to select.
How Redundant Soft VC Destinations Work
This section describes how the redundant soft VC destinations work in the following two possible
configurations:
configurations:
•
•
Redundant Soft VC Destinations on the Same Switch
After using the soft redundancy group command to configure the NSAP address on an ATM interface
the 19-byte prefix of the NSAP address is advertised over the PNNI. If the active and standby interfaces
are configured on the same switch using the same 19-byte prefix of that NSAP address, one entry appears
in the ATM routing tables for all nodes in PNNI network. For example, using the show atm soft
redundancy command on Switch-A with redundant destinations configured shows the following:
the 19-byte prefix of the NSAP address is advertised over the PNNI. If the active and standby interfaces
are configured on the same switch using the same 19-byte prefix of that NSAP address, one entry appears
in the ATM routing tables for all nodes in PNNI network. For example, using the show atm soft
redundancy command on Switch-A with redundant destinations configured shows the following:
•
Group name: TEST
•
NSAP address: 47.0091.8100.1111.1111.1111.2222.2222.2222.2222.00
•
Redundant interfaces: ATM 2/0/2 (currently active) and ATM 2/0/3
Switch-A# show atm soft redundancy group TEST
Group Name: TEST
Nsap Address: 47.0091.8100.1111.1111.1111.2222.2222.2222.2222.00
Operating Mode: Active/Standby
Configured Active Interface: ATM2/0/2 (Status: Up, Currently Active)
Configured Standby Interface: ATM2/0/3 (Status: Up)