[nsp] Cat3500XL & management VLAN: Encapsulation of IP packets fails

[Matti Saarinen]

I configured Cricket to collect information from a Cat 3500XL stack.
Obviously, the commander of the stack did not like the several SNMP
get and getnext queries directed towards and it stopped sending or
receiving IP packets to its managament VLAN interface. All the VLANs
cofigured on the switch work, even the one to which the management
interface belongs.

With debug ip packet and debug IP arp I managed to get the following
output.

sw#ping x.y.z.65

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.y.z.65, timeout is 2 seconds:

32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, sending
32w1d: IP ARP: creating incomplete entry for IP address: x.y.z.65 interface VLANn
32w1d: IP ARP: sent req src x.y.z.80 0002.fd1a.a240,
                 dst x.y.z.65 0000.0000.0000 VLANn
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, encapsulation failed.
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, sending
32w1d: IP ARP throttled out the ARP Request for x.y.z.65
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, encapsulation failed.
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, sending
32w1d: IP ARP: sent req src x.y.z.80 0002.fd1a.a240,
                 dst x.y.z.65 0000.0000.0000 VLANn
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, encapsulation failed.
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, sending
32w1d: IP ARP throttled out the ARP Request for x.y.z.65
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, encapsulation failed.
32w1d: IP: s=x.y.z.80 (local), d=x.y.z.65 (VLANn), len 100, sending
32w1d: IP ARP: sent req src x.y.z.80 0002.fd1a.a240,
                 dst x.y.z.65 0000.0000.0000 VLANn
32w1d: IP: s=x.y.z.80 (local), d=130.230.70.65 (VLANn), len 100, encapsulation failed.


Has anyone else experienced anything similar? Is there any way except
reload to fix this problem?

Cheers,

-- 
- Matti -