I have an small SNMP issue that effects my network monitoring systems.

I have a vlan here that manages all my routes and switches. We will call it vlan 1, I have a set of routers that connect via a T-1 to a Cisco 4506 core on the far side. It has a management vlan 2. I can monitor all switches and routers in vlan 1. I can monitor the router on the far side in vlan 2, and the 4506 in vlan 2. Off the 4506 I have several IDFs that are connected via fiber and the ports are trunked. I can not monitor any of these devices in vlan2 Thou the core and router can ping them. I can establish an SSH connection to each of them from the core. I can also get to them if I add a system into that vlan. BTW, I can get to other switches that are not trunked, and servers that are not trunked. And devices off these switches function normally.

If I traceroute the devices I will make it to the core and then get dropped.

I have band-aided the issue by adding a dual-homed polling server into vlan 2 and then it can see all the devices and sends the info-back to our monitoring systems. While that works, I want to solve the real issue(s).

BTW, no ACLs are in place currently on these VLANS