Hi! I've Cisco 7201 router acting as PE that floods the network with ARP requests and I cannot understand, why?
The router is connected to the network core with an interface GigabitEthernet0/1 in trunk mode: interface GigabitEthernet0/1 mtu 1618 no ip address end And there are multiple client-facing sub-interfaces configured similar to: interface GigabitEthernet0/1.1993 encapsulation dot1Q 1993 ip unnumbered Loopback4 end Some sub-interfaces have non-unnumbered IP address assigned. Note ARP-proxying is not disabled. The router also uses an interface GigabitEthernet0/0 as IP up-link/MPLS: interface GigabitEthernet0/0 mtu 1636 ip address X.X.X.X 255.255.255.252 ipv6 address Y:Y:Y:Y::Y/64 ipv6 enable mpls label protocol ldp mpls ip end The problem: the router sends lots of untagged ARP broadcasts (requests) over its GigabitEthernet0/1 to a switch. I've enabled local SPAN mirroring at the switch to make sure this is true. The requests are from router's MAC address and some of its IPv4 addresses without 802.1q tags. Lots of unneeded ARP broadcasts is no good. Why does it do so? The router has not any interface with "encapsulation dot1Q 1". It runs c7200p-adventerprisek9-mz.152-4.M6.bin Switch mirroring configuration is the following: monitor session 1 source interface Gi2/3 tx ! to the traffic analyzer monitor session 1 destination interface Po14 It should not strip 801.1q tags while mirroring and I really have tags for other kinds of mirrored packets seen at my traffic analyzer. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
