in our network with a C5 as a Core Router, we see sporadic connectivity loss of some hosts.
These hosts are reachable from the same vlan, but from other vlans, they are not.
If I ping from the C5 Router to these hosts, they are reachable from all other vlan again.
If we wait longer, these hosts get reachable after some time ( abaut 5-30 min) again.
It seems, that this is an arp issue on the C5 Router. The Router arp has still the entry of the host.
But the Switch has no more mac entry in his Mac table, and the C5-switch does no arp request to renew this hosts mac entry.
Any idea ?