Hi All, I am running version 10.2 and ran into an issue where ICMP is not working correctly Here is the setup I just recently deployed a ADC where the Primary and Secondary ADC is connected to VLANX on a newly constructed Cisco Switch Router. When initiating pings from the ADC to the HSRP shared address of VLANx or to any address on VLANx, or to addresses to VLAN Y and z, there is no response. However, if I initiate a ping from the switch on VLAN X, Y and Z I recieve a response. Also the ADCs can ping ping each other. I performed some sniffer traces but for some reason I can't see how the packets are being ignored which they are. Networker

Hi Networker, Without a network diagram it's hard to say what the issue could be. Is it possible to provide a network diagram? It doesn't have to have the real addresses but it will help the community understand where we can assist you the best. thanks, Bhattman

Hi Bhattman, Wow...what a quick response. Unfortunatly, I cannot provide a network diagram. However, I can provide some additional details The ADC is directly connected to VLAN X. However, VLAN Y and Z are class C segments that the ADC is not connected to but the switch is carrying the segments. So all traffic is staying on the same set of switches. We are using Cisco Nexus 7010s running v4.2 NX-OS code. The ADCs are 8900s. What other information do you need? Networker

Hi Networker, Normally I don't get to respond because there are so many other talented volunteers in this community like Hoolio and Chris who manage to always beat me to the punch :-). Hopefully they can show up and help out as well As you mentioned you are using Cisco Nexus 7010s. There are several considerations when using that particular switch. Can you tell me if you are running any special configurations beyond the normal L2/L3 configurations you find in Cisco IOS. For example VDC, VPC, Unified Fabric configurations? Bhattman

Thanks again for responding. I am at my wits end on this one. Been trying to figure this out for 5 days now. I am running VDC and VPC, which we have ran in the past. Infact, I have a environment similiarly setup else which works fine. Networker

Hi Networker, No problem. Let's see if we can't get you close to your solution as possible. Are all the VLANs in the same VDC? If they are on separate VDCs do you have any wiring configured so you can route between them on the same switch? Also in the other environment you mentioned is the ADC connected to the Cisco Nexus Core Switch or another Devices somewhere downstream or upstream? Bhattman

ICMP Blues | DevCentral

16 Replies

The_Bhattman
Nimbostratus
Mar 16, 2011
Hi Networker,

I can't tell you if it's going to cause an outage, since I don't how you have configured that switch router, but in my experience I have not seen it cause a problem.

Bhattman
Networker_66674
Nimbostratus
Mar 16, 2011
HOLLY CRAP!!! YOUR DA MAN!!! PINGS are now coming accross. THANK YOU THANK YOU Bhattman.

Does this issue mean there is a problem with the F5? Like a bug or something?

Networker
The_Bhattman
Nimbostratus
Mar 16, 2011
Hi Networker,

Glad to be of assistance. Hopefully this proves to be stable ongoing.

Not sure if you can classify this as a bug. I mean if it was a bug then Cisco wouldn't have came out with this command so obviously it's not only addressing something that F5 utilizes but other devices. However, I recommend talking with Cisco TAC or your SE to see the long term implications in your environment.

Glad to be of help

Bhattman
Networker_66674
Nimbostratus
Mar 16, 2011
Excellent. I am going to do that. Now I can get some sleep.

Thank you again Bhattman

Cheers,

Networker
hooleylist
Cirrostratus
Mar 16, 2011
Nice work Bhattman!

Aaron
The_Bhattman
Nimbostratus
Mar 16, 2011
Hi Networker,

I did a Google on vPC Peer Gateway and came upon an article that you will find an excellent blog explanation on vPC peer-gateway and HSRP.

http://www.jeremyfilliben.com/2010/08/hsrp-vpc-and-vpc-peer-gateway-command.html

Here are one more article blog on vPC

http://bradhedlund.com/2010/12/16/routing-over-nexus-7000-vpc-peer-link-yes-and-no/

Bhattman

Forum Discussion

ICMP Blues

16 Replies

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