Setup guide

5-2
Cisco 6400 Software Setup Guide
OL-1183-04
Chapter5 Redundancy and SONET APS Configuration
Memory Requirements
Figure5-1 Cisco 6400 Carrier-Class Broadband Aggregator
Memory Requirements
When configuring redundancy between two NRPs or two NSPs, the two cards must have identical
hardware configurations. Check each card in a redundant pair, and make sure they share the following
parameters:
• DRAM size
• Flash memory size
• PCMCIA disk size (NSP only)
• Hardware version (module part number)
If redundancy is configured between two cards with different amounts of memory or disk capacity, the
Cisco 6400 will display a warning message. Depending on which card is identified as the primary card,
the Cisco 6400 will perform the following actions:
• Primary card has more memory than secondary card—The Cisco 6400 shuts down the secondary
card.
• Secondary card has more memory than primary card—The Cisco 6400 displays a message,
indicating that the secondary card has more memory than the primary card. This configuration will
cause redundancy to be disabled if the secondary card is activated.
Note This approach allows for memory upgrades on a redundant pair of NRPs or NSPs. For information about
performing memory upgrades, see the Cisco 6400 UAC FRU Installation and Replacement document.