Guest

Cisco 6400 Series Broadband Aggregators

Field Notice: Memory Requirements for Redundant NRP and NSP Configuration on the Cisco 6400 UAC


April 6, 1999



Products Affected

Product

Remarks

Cisco 6400 with node route processor (NRP) and node switch processor (NSP) redundant configurations

Memory mismatch can prevent secondary NRP/NSP from coming up.

Problem Description

This is a notice of a potential configuration mismatch for customers configuring NSP's and NRP's as redundant in the Cisco 6400 Universal Access Controller (UAC).

The primary and secondary NRP should have identical amounts of memory. If they do not, the following will happen, as is described in CSCdm11496 (see the DDTS section below for details):

Primary

Secondary

Effect

64MB

64MB

Good configuration

128MB

128MB

Good configuration

128MB

64MB

Illegal config. Secondary fails to come up, and primary displays message at console indicating that the secondary has incorrect amount of memory and has been shut down. This is done because there is no guarantee that a config that works correctly in 128MB on the primary will be able to run in 64MB on the original secondary if it becomes primary.

64MB

128MB

Configuration not recommended. Primary and secondary boot successfully, however, a message displays (after fix for CSCdm08691) and indicates that that the secondary has more memory than the master, and that this will cause redundancy to be disabled if the original secondary ever becomes primary. This message is displayed once as a warning.

Note:?This configuration is allowed because it provides a way to upgrade the amount of memory on NRPs and NSPs that is minimally disruptive. You would upgrade memory on the secondary first, switch it to become the primary, and then upgrade memory on the original primary.

Please note that even without CSCdm08691, the last configuration is legal. The difference is that after CSCdm08691, a message will be displayed for the user to warn them that they have created a potentially illegal configuration as far as redundancy is concerned.

Background

The orderability system has no way to verify that a customer is ordering a spare NSP or NRP with the same memory configuration as the board for which it is a spare. Also, customers can upgrade a non-redundant system to a redundant system by adding spare NSPs and NRPs at a later time than the original order; again, the orderability system has no way to verify that the memory configurations match.

Problem Symptoms

Secondary fails to come up, and primary displays message at console indicating that the secondary has incorrect amount of memory and has been shut down.

Here is an example of console output when memory mismatch is discovered:

00:09:30: %SYS-5-CONFIG_I: Configured from console by console
00:09:31: %EHSA-3-IPC: Invalid redundancy configuration:
Secondary has less memory (65536K) than Primary (131072K).
g terminal
00:09:33: %EHSA-3-IPC: Invalid redundancy configuration:
Secondary has less memory (65536K) than Primary (131072K).
00:09:35: %EHSA-3-IPC: Invalid redundancy configuration:
Secondary has less memory (65536K) than Primary (131072K).
00:09:37: %EHSA-3-IPC: Invalid redundancy configuration:
Secondary has less memory (65536K) than Primary (131072K).
00:09:39: %EHSA-3-IPC: Invalid redundancy configuration:
Secondary has less memory (65536K) than Primary (131072K).

Workaround/Solution

When used in a redundant configuration, the primary and backup cards should have identical hardware configurations, especially with optional hardware. For NSPs, this includes DRAM size, flash size, and flash disk size. For NRPs, this includes DRAM size and flash size.

Orderability has been updated to allow multiple NSP/NRP's to be ordered in a system. It will require that the memory options be equal at the time of the order.

This is a list of the orderable Memory options for the NSP and NRP. Note "SPARE" next to the options that can be ordered as spares.

MEM-NSP-64M (NSP 64 Meg DRAM (default))
MEM-NSP-128M (NSP 128 Meg DRAM (option)) SPARE
MEM-NSP-FD20M (Cisco 6400 NSP 20 Meg Flash Disk) SPARE
MEM-NSP-FD220 (NSP 220 Meg Flash Disk (option)

MEM-NRP-64M (NRP 64 Meg DRAM (default))
MEM-NRP-128M (NRP 128 Meg DRAM (option)) SPARE
MEM-NRP-FLC8M (NRP 8 Meg Flash Memory (default)) SPARE
MEM-NRP-FLC20M (NRP 16 Meg Flash Memory (option)) SPARE

Related Bugs

View CSCdm08691

View CSCdm11496

For More Information

For more information on this configuration notice, refer to the Release Note for release 11.3(8)DB1, open caveats, and CSCdm11496 for the NRP. The next NSP Release Note will include this info for the NSP. Inquiries on this subject can be emailed to cs-6400@cisco.com

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods: