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New Member

Routing

Dear All;

I have Cisco 7609 router with 2 sup 720 installed in slot 5 & 6.

On the same cisco 7609 router I have 2 WS-SVC-CMM-6E1 in slot 1 & 2.

I put an IP Address in Cisco 7609 in gigabitethernet port 5/2 (media type rj-45) let say 10.0.0.1/8 and in the CMM module I used 10.0.0.5/8 in gigabitethernet port 1/2.

I cannot ping 10.0.0.1 from CMM with IP address 10.0.0.5 or from Cisco 7609 to CMM.

Any ideas.

Thanks

6 REPLIES
New Member

Re: Routing

They need to be part of different subnets. By configuring 5/2 with an IP address you've made that port a Layer3 termination point which owns the entire 10/8 network behind it. The only way you can make 5/2 part of the same L2 as the CMM is to configure 5/2 as a switchport to be in the same VLAN as the CMM. Then you'll need to create a VLAN interface and assign it an address in the 10/8.

You can check the docs for more details here:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123limit/123x/123xy8/gtcmm.htm

New Member

Re: Routing

Hi,

Thanks for the info. I created a vlan 10 and assigned 10.0.0.1/8 on that then I configure the gig5/2 port but is not accepting it says " gig5/2 is not a switchng port"

Router(config)#interface vlan 10

#ip address 10.0.0.1 255.0.0.0

GigabitEthernet 5/2:

Router(config-if)#switchport access vlan 10

If you want I will attach the config of the 7609 and the CMM to get the whole picture.

Thanks for your help and waiting for your reply.

Hall of Fame Super Silver

Re: Routing

Seeing the whole picture would be helpful. Please do post configs.

HTH

Rick

New Member

Re: Routing

Hi Rick,

Please check the configs.

Thanks.

Hall of Fame Super Silver

Re: Routing

Let me say first that I do not have direct experience with the 7600 and CMM and there may be some things about it that I am not aware of. But it looks to me that the problem is that you are assigning addresses to two interfaces that are in the same subnet. This would work if both interfaces were connected in the same broadcast domain. But they are not.

Essentially the problem is that if you are on the CMM with address 10.0.0.5 255.0.0.0 and you ping 10.0.0.1 then the CMM interface will ARP for 10.0.0.1 because it believes that it is in the directly connected subnet. But there is no ARP response because 10.0.0.1 is not in the same broadcast domain. Therefore ping fails. And it is the same situation on the 7600 if 10.0.0.1 attempts to reach 10.0.0.5.

I believe that the solution is to configure addresses and masks on the interfaces so that they are in different subnets.

HTH

Rick

New Member

Re: Routing

Hi Rick,

Thanks for the info. Yes you are right, I created a vlan and put an address under this vlan and everything is perfectly well.

Now I can ping from CMM to 7609 and vise versa.

Thank you.

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