Your router may be configured with subinterfaces each being the default gateway for your VLANs. If you post your config, we can help determine what is what.Here's an example of a trunked router interface.
interface FastEthernet0/0 description Connection to 2950 no ip address ip directed-broadcast 150 speed 100 full-duplex
interface FastEthernet0/0.100 description Client Vlan encapsulation dot1Q 100 ip address 10.11.1.254 255.255.255.0 ip helper-address 10.10.12.7 ip helper-address 10.10.11.13 no ip redirects no ip unreachables ip directed-broadcast 150 no ip proxy-arp ip flow ingress ip tcp adjust-mss 1360 ! interface FastEthernet0/0.500 description Management encapsulation dot1Q 500 ip address 10.10.44.254 255.255.255.0 ip access-group MNA out no ip redirects no ip unreachables no ip proxy-arp ip flow ingress ip tcp adjust-mss 1360 ! interface FastEthernet0/0.501 description Native Vlan encapsulation dot1Q 501 native ip flow ingress !
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I am attaching the relevant snip of the Cisco 2821. So, following Giuslar's discussion, I would tend to agree that the 3750 is handling the vlan tagging and that info does not get passed on to the PS7500. So, my only option is to work at layer 3 and identify traffic based on the source subnets.
interface Tunnel0 description Tunnel to 2821-02 ip vrf forwarding sam ip address 192.168.200.78 255.255.255.240 ip mtu 1450 ip tcp adjust-mss 1410 ip ospf message-digest-key 1 md5 7 15221F252338243138 ip ospf network point-to-multipoint ip ospf 1 area 0.0.0.0 qos pre-classify tunnel source GigabitEthernet0/1 tunnel destination 192.168.102.1 ! interface GigabitEthernet0/0 description To Internet Firewall ip vrf forwarding PTI ip address 192.168.100.21 255.255.255.252 ip ospf 1 area 0.0.0.1 duplex full speed 100 service-policy output CBWFQ ! interface GigabitEthernet0/1 description To WAN ip address 192.168.100.17 255.255.255.252 duplex full speed 10 service-policy output CBWFQ ! interface GigabitEthernet0/0/0 description To LAN distribution switch ip vrf forwarding sam ip address 192.168.100.6 255.255.255.252 ip ospf message-digest-key 1 md5 7 023610722C1400345C ip ospf 1 area 0.0.0.0 negotiation auto ! router ospf 1 vrf sam log-adjacency-changes detail area 0.0.0.0 authentication message-digest default-information originate ! ip route 0.0.0.0 0.0.0.0 192.168.100.18 ip route vrf sam 0.0.0.0 0.0.0.0 192.168.100.22
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