problem with vlan + arp
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||
|
Posted by Matteo on September 7, 2008, 6:27 am
Please log in for more thread options Hi, I have this situation, cisco 2811 + some catalyst 3560, connect in "trunk mode" and other unmanaged switch connect to catalyst 3560 with port configure in "access mode". Cisco 2811 term every vlan using sub-inf in "encapsulation dot1q vlan- id" and doing routing between every vlan. Sometimes some host connect to unmanaged l2 switch not reply to ping, this host usually are Access Point Mikrotik or Motorola, but traffic flow regular, infact if I connect in our l2 domain I can ping they...... so I type on cisco 2811 on console "clear arp-cache" and every return to work fine. I check arp table and it is correct, I disable ip proxy-arp on sub-inf but nothing. Every catalyst in trunk mode is connect to other by wireless link by Alavarion in bridge mode. I haven't ideaa.... have you somethings that I can try ?? Thank you so much in advance, Matteo | |||||||||||||
|
Posted by Thrill5 on September 8, 2008, 12:06 am
Please log in for more thread options The problem could be that the default arp-cache timeout on the router and the default mac-address timeout on the switches are different. I have run into this problem before and I consider this to be a bug (but Cisco doesn't.) Cisco recommends setting the arp-cache timeout on each VLAN to 300 seconds (which is the default mac-address timeout on the switches) using "arp timeout 300" on each VLAN interface. After not hearing from that IP address, the router interface will broadcast an ARP request, and the switches will relearn which port the MAC address belongs to. | |||||||||||||
|
Posted by Matteo on September 8, 2008, 3:47 pm
Please log in for more thread options
Thank you, I add "arp timeout 300" and now I check if it work fine, tomorrow I reply somethings to you. Bye Matteo > The problem could be that the default arp-cache timeout on the router and
run
> the default mac-address timeout on the switches are different. =A0I have = > into this problem before and I consider this to be a bug (but Cisco
to
> doesn't.) =A0Cisco recommends setting the arp-cache timeout on each VLAN = > 300 seconds (which is the default mac-address timeout on the switches) us=
ing
> "arp timeout 300" on each VLAN interface. =A0After not hearing from that =
IP
> address, the router interface will broadcast an ARP request, and the
> switches will relearn which port the MAC address belongs to. > > > > > > > Hi,
>
> > I have this situation, cisco 2811 + some catalyst 3560, connect in
> > "trunk mode" and other unmanaged switch connect to catalyst 3560 with > > port configure in "access mode". > > Cisco 2811 term every vlan using sub-inf in "encapsulation dot1q vlan- > > id" and doing routing between every vlan. > > Sometimes some host connect to unmanaged l2 switch not reply to ping, > > this host usually are Access Point Mikrotik or Motorola, but traffic > > flow regular, infact if I connect in our l2 domain I can ping > > they...... so I type on cisco 2811 on console "clear arp-cache" and > > every return to work fine. > > I check arp table and it is correct, I disable ip proxy-arp on sub-inf > > but nothing. > > Every catalyst in trunk mode is connect to other by wireless link by > > Alavarion in bridge mode. >
> > I haven't ideaa.... have you somethings that I can try ??
>
> > Thank you so much in advance,
>
> > Matteo- Nascondi testo citato
>
> - Mostra testo citato - | |||||||||||||
| Similar Threads | Posted |
| VLAN problem | May 11, 2006, 1:03 am |
| problem with vlan + arp | September 7, 2008, 6:27 am |
| VLAN configuration problem | December 19, 2005, 1:11 am |
| CISCO 2950 vlan config problem | August 18, 2005, 9:01 am |
| cisco1811: mac addresses from vlan interfaces problem | November 24, 2006, 7:51 pm |
| Cisco 877 Router - VLAN/DMZ Configuration/Problem | February 15, 2007, 6:07 am |
| Cisco 3550 VLAN-Internet routing problem | March 25, 2006, 7:15 am |
| Catalyst 3200/LS1010 Vlan trunking problem | December 22, 2007, 7:05 am |
| Cisco Softphone Vlan Versus Preexisting Hardphone Voice Vlan | September 23, 2005, 7:43 am |
| VLAN Security vs. Inter-VLAN Routing | December 18, 2007, 4:26 pm |
| Native, and management vlan "Vlan 1" | September 21, 2005, 2:50 pm |
| User's VLAN and special VLAN | August 25, 2006, 11:45 am |
| VLAN Project and Native VLAN | July 13, 2007, 5:06 am |
| VLAN port with internet access can access only one vlan? | April 21, 2006, 3:38 pm |
| VLAN | August 17, 2005, 3:11 pm |
>
> I have this situation, cisco 2811 + some catalyst 3560, connect in
> "trunk mode" and other unmanaged switch connect to catalyst 3560 with
> port configure in "access mode".
> Cisco 2811 term every vlan using sub-inf in "encapsulation dot1q vlan-
> id" and doing routing between every vlan.
> Sometimes some host connect to unmanaged l2 switch not reply to ping,
> this host usually are Access Point Mikrotik or Motorola, but traffic
> flow regular, infact if I connect in our l2 domain I can ping
> they...... so I type on cisco 2811 on console "clear arp-cache" and
> every return to work fine.
> I check arp table and it is correct, I disable ip proxy-arp on sub-inf
> but nothing.
> Every catalyst in trunk mode is connect to other by wireless link by
> Alavarion in bridge mode.
>
> I haven't ideaa.... have you somethings that I can try ??
>
> Thank you so much in advance,
>
> Matteo