Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

can server config bring my vlan down

Hi,

I want to know that is there any configuration at the server side(windows) with 2 nic cards both in different vlans configured can cause one of my whole vlan down.

i was getting error on my switch

The % STANDBY-3-DIFFVIP1 error message

according to cisco it can be due to 2 reasons :

There are two reasons why the STANDBY-3-DIFFVIP1 error message occurs:

The virtual IP address in the hello packets sent by the active router does not match with the virtual IP address configured on the standby routers for the same group. The root cause for this error is the virtual IP address misconfiguration on any of the HSRP routers.

There is inter-VLAN leakage due to bridging loops in the switch.

I think second reason could be the reason , can any one help

thanxs in advance

Rds

Sandeep

1 ACCEPTED SOLUTION

Accepted Solutions

Re: can server config bring my vlan down

Inter-vlan leak is very possible specially if the windows have dual NIC and are in different vlans. It's easy to confirm, Can you try disconnecting one of them and see if the error stop?

11 REPLIES

Re: can server config bring my vlan down

Inter-vlan leak is very possible specially if the windows have dual NIC and are in different vlans. It's easy to confirm, Can you try disconnecting one of them and see if the error stop?

New Member

Re: can server config bring my vlan down

yes the problem was solved after shutting the ports of the server but i want to understand what configuration on the server can even bring down the switch vlan down pls expalin in detail or any specific url is there on the net pls do recommend.

New Member

Re: can server config bring my vlan down

can any one help me out its urgent

thanks in advance

Sandeep

New Member

Re: can server config bring my vlan down

can any one help me out on this

tanks in advance

sandeep

Bronze

Re: can server config bring my vlan down

Hi Sandeep,

There is no configuration of the server that can bring the VLAN down as such.

If there are bridging loops in the network, it might be due to a poorly designed / implemented STP instance.

You might have to inspect your topology thoroughly well and ensure the ports on all switches are configured appropriately.

In case your switches are not running very high CPU utilization do consider the use of PVST in place of CST.

Use a packet analyzer like etheral (you can google for it) to analyze per vlan traffic and determine where exactly the problem might be

HTH

Arvind

New Member

Re: can server config bring my vlan down

Dear Arvind ,

As you can see in the previous reply one of the friends has mentioned if a server is having more than one nic and both the nics are configured in diff vlans it can bring down the whole vlan.

Rgds

sandeep

Bronze

Re: can server config bring my vlan down

Hi Sandeep

Im using a configuration similar to what you are i.e. 2 nics on 2 vlans branching off the same server heading into the same switch. However since the VLANs are two different broadcast domains, I have no issues with respect to an unstable STP topology, maybe you could post your configuration in greater detail?

Regards

Arvind

New Member

Re: can server config bring my vlan down

Dear Arvind,

The 2 nics are going into two diff switches than and both are having same configurations and are using HSRP between them.

rgds

Sandeep

Bronze

Re: can server config bring my vlan down

Are both nics members of the same VLAN with the same default gateways configured?

Re: can server config bring my vlan down

The only way this would happen is if the NICs are bridged. The same packet going out of one port and into one nic is coming out the other NIC into the other port in the same switch. do you see mac-address being learned from one port then to another? is you'r cam agingtime time for these vlans remains at 300 secs? If the NICs are causing a loop and I think they are, then you will see that the same packet going out of one port is the same packet coming in on another port. Make sure that the NICs are not doing any kind of "channeling" or redundancy/resiliency that causes it to transparently bridge the rx packet on one NIC and tx it on another NIC.

Bronze

Re: can server config bring my vlan down

That was precisely what was in my mind but I just couldnt put it across as nicely as bosalaza did! :)

Just curious... other than this scenario, how would vlan information "leak" out ?

154
Views
5
Helpful
11
Replies