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.
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.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...