Hey Everyone - We have two 7507 routers configured with dual RSP4s w/256MB RAM, VIP2-50s with 128/8MB RAM, Gig, POSIP OC3 and Fast Ethernet interfaces. These routers have run flawlessly for over two years now. But about two weeks ago, all of a sudden we started having serious crashing problems with these two routers. The routers will lose bgp connectivity (one at a time) to our upstreams (configured on each router). First, we would see a keepalive not sent message, then a bgp hold timer expire, then the bgp peering session would go down. OSPF would start crashing, then we would see the memory error messages, then all interfaces would blink off-line. (Note - we are running the max memory we can on both the RSPs and the VIPs). Within 1 minute, the exact same thing would happen to the other router. Often times we would have to reboot the router to get it to come back online. We would see the following errors and have to reboot multiple times to get the router back: %SYS-2-MALLOCFAIL: Memory allocation of 704 bytes failed from 0x60329F00, alignment 0 Pool: Processor Free: 92744 Cause: Memory fragmentation Alternate Pool: None Free: 0 Cause: No Alternate pool -Process= "Pool Manager", ipl= 0, pid= 6 -Traceback= 6038049C 60382200 60329F08 6038DEDC %TCP-6-NOBUFF: TTY0, no buffer available -Process= "BGP Router", ipl= 0, pid= 132 %% Low on memory; try again later GigabitEthernet1/1/0: keepalive not sent We are running the latest S train IOS patched for the IPV4 issue - however downgrading to the code we had run for the previous year did not solve the problem, nor did replacing the RSPs, VIPs and interfaces with new cards. In addition, we have complied with the Cisco recommendations for mitigating the effects of the Nachi Worm. http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186... We also shut down one of the routers totally and the other router still experienced the same issue. None of these updates or fixes have solved the problem. I am thinking it may have something to do with all the virus stuff running around (same thing was crashing my Lucent TNT's), but I cannot seem to get an answer from Cisco, nor can I find anyone seeing the same issues. Hopefully someone here can shed some light on this problem. Thanks in Advance Richard I fly because it releases my mind from the tyranny of petty things . .