Help required - mac address table, virtual pc/ip addressing issue
Hi, hope someone out there can help?
This is the scenario
SW1 (WS-C2960G-48TC-L) port gig0/1 has a PC connected to it with ip address 10.182.8.6 and a Virtual IP address 10.182.8.107 SW2 (WS-C2960-24TT-L) port gig 0/1 has a PC connected to it with ip address 10.182.8.106
The system is designed so that if there is an issue with the PC connected to SW1, the PC on SW2 will take over the Virtual IP address and continue working.
We have a couple of other PC's in different subnets to the above PC's that use the Virtual IP (VIP) address to communicate with the PC that is 'on line'.
Unfortunately, the vendors software doesn't currently gratuitously refresh the arp to advertise the change of mac address for the VIP.
Is there anyway we can get the 2 dcnsw to 'refresh' on a regular time period to capture when the VIP changes to the other PC?
Help required - mac address table, virtual pc/ip addressing issu
Without meaning to sound rude, the software which uses a VIP is not very well designed if it is not capable of sending a Gratuitous ARP one the Active one fails.
The default ARP cache timeout is 4 hours so an ARP entry will remain in the table and once the timeout is up, the switch will send an ARP to check if the device is still alive and if not, remove the entry from the table.
You could look at reducing the ARP timeout on a per port basis:
#arp timeout 60
This will change the ARP cache timeout to 60 seconds for that port but having not used this before, I am not 100% this will address your issue. I would not advise trying to change the global ARP cache timeout for a production switch as this will increase ARP traffic and could cause problems if reduced to a small value.
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...