When a cable is unplugged from a Cisco switch, how is the "down" port state advertised over the segment ? How are the cam and arp tables affected for the segment? Can the switch be forced to advertise a down port to inform nodes connected over trunk ports ?
I have 4 devices connecting LOCAL and REMOTE networks
2 3750 switches, A+B
2 2600 routers, C+D
LOCAL
A---B Trunk A-B
C---D Trunk C-D
REMOTE = 192.168.130.9/24
In A and B, Static routes to REMOTE network are redistributed through EIGRP to LOCAL.
Both static routes have admin distance of 10 to REMOTE ,for load balancing
In switch-A
ip route 192.168.130.9 255.255.255.248 C 10
ip route 192.168.130.9 255.255.255.248 D 10
In switch-B
ip route 192.168.130.9 255.255.255.248 C 10
ip route 192.168.130.9 255.255.255.248 D 10
Normally, these routes cause all traffic from A->REMOTE to be balanced
between A-C and A-B-D paths.
If the link B-D goes down, will the static route cause A to continue sending packets to B, even though D is down and B knows it ? Or will the switch somehow inform the rest of the segment ?
