[nsp] access-list log entry question

[Greg Pendergrass]

I got this log entry on a 7513:

Dec  5 16:46:58.996 EST: %SEC-6-IPACCESSLOGNP: list monitor-IP permitted 255
x.x.x.x -> y.y.y.y, 493066 packets

I put an access list on an interface to monitor the traffic from a customer,
a simple permit ip any any log, and I got this entry today. What does the
255 mean? Some lines have tcp, some have udp, some have icmp, but not 255. I
suspect it's some sort of dDOS traffic, can anyone confirm that?

Thanks,

Greg