I have configured VLAN300 through 3 switches:
customer--C2960 - C7600 - C6500--customer
As it can be seen customer is connected via Ethernet(VLAN300).Customers has multicast traffic and on both sides sender and receivers.
I don't have multicast enabled on my switches, and regarding multicast configuration is default on all devices.
Problem starts when I configure Interface VLAN 300 on C7600, then sh proc cpu shows 100%/98% (which indicates that packets goes to CPU).
on C2960 and C6500 CPu utilisation is normal 3%.
I sniffed the traffic and packets are (50Mbps in each direction):
src IP: 10.10.10.101 port UDP 49152 dst IP: 126.96.36.199 port UDP 2001
src IP: 192.168.100.100 port UDP 4915 dst IP: 188.8.131.52 port UDP 1234
TTLs are 64, and also all checksums are correct.
when I put interface VLAN300 to shutdown, CPU utilisation on C7600 goes to 3%.
interface vlan300 doesn't have ip address, I was planning to use it just for policinig (to rate limit traffic on VLAN 300 - mls qos vlan-based)
C7600 has sup720BXL and IOS 12.2(18)SXF.
Why CPU utilisation goes to 100% when I just create interface VLAN, even without IP address?
Thanks in advance,