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New Member

CSM sees the gateway as DOWN

Hi,

Running on bridge mode, our CSM is seeing the gateway I created for the client as being down when I do the "show mod csm # arp". Below is the config:

CSM:

vlan 100 client

ip address 10.1.1.8 255.255.255.0

gateway 10.1.1.1

vlan 200 server

ip address 10.1.1.8 255.255.255.0

serverfarm TEST

nat server

no nat client

real 10.1.1.87

inservice

vserver TEST-80

virtual 10.1.1.40 tcp www

serverfarm TEST

persistent rebalance

inservice

MSFC:

interface Vlan100

ip address 10.1.1.1 255.255.255.0

show mod csm 9 arp

10.1.1.1 00-00-00-00-00-00 100 GATEWAY down(4 misses)

10.1.1.8 00-02-7E-E5-22-5A 100/200 --SLB-- local

10.1.1.40 00-01-64-F9-1A-01 0 VSERVER local

10.1.1.87 00-00-00-00-00-00 0 REAL down(4 misses)

I'd appreciate it if anyone can shed some light on why this is happening what can be done or modified on the config to bring the reals and the gateway UP. Will clearing the CSM arp-cache fix it? What is the impact of doing this on a production environment? Thanks.

BTW, the other bridge subnets in production on the same MSFC/CSM work just fine and the only ones that don't work are the newly created ones. Thanks again.

5 REPLIES
Cisco Employee

Re: CSM sees the gateway as DOWN

if it is down, this is because the csm does not get an arp response from the gateway.

Make sure the gateway is in the right vlan (100) and reachable.

Check layer 2 mac address table to verify the L2 path between csm and gateway.

There is nothing else to do.

Gilles.

New Member

Re: CSM sees the gateway as DOWN

Hi Gilles I am having exactly the same problem:

The gateway is configured on the MSFC of the same switch that CSM is running on.

MSFC:

interface Vlan401

ip address 10.65.1.2 255.255.255.0

standby 101 ip 10.65.1.1

no ip redirects

CSM:

vlan 401 client

ip address 10.65.1.8 255.255.255.0

gateway 10.65.51.1

vlan 501 server

ip address 10.65.1.8 255.255.255.0

#sh mod contentSwitchingModule 9 arp

10.65.1.1 00-00-00-00-00-00 401 GATEWAY down(4 misses)

10.65.1.8 00-02-7E-E5-22-5A 401/501 --SLB-- local

10.65.1.60 00-00-00-00-00-00 501 REAL down(4 misses)

Any help would be appreciated.

Dmitry.

Cisco Employee

Re: CSM sees the gateway as DOWN

Your standby ip is misconfigured

standby 101 ip 10.65.1.1 <====

Should be 10.65.51.1

Gilles.

New Member

Re: CSM sees the gateway as DOWN

Thank you Gilles, that was a typo when I copied the config to the message. I found my error, I left out the 451 L2 VLAN from the trunk port configuration to the CSM module. After adding the VLAN to the trunk I was able to see the MAC for the gateway.

Thank you, your previous reply message to Orlan helped me find my error.

Dmitry.

New Member

Re: CSM sees the gateway as DOWN

Please make sure if your real server (10.1.1.87) work properly. Is it pingable?

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