I already opened a support case for this and was basically told "that's the way it is". I am hoping someone from the community with real world experience can give me more clue. The situation is that I have a Cisco 3800 series router with two Tunnel interfaces on it. One of the tunnels shows up as a result of discovery and the other one doesn't. From the point of view of the router the interface is properly identified by SNMP (Tunnel 0 does NOT show up in NPM - it is in blue; Tunnel 1 does show up, in red):
Core2-3845#show snmp mib ifmib ifindex
GigabitEthernet0/0: Ifindex = 1
Null0: Ifindex = 3
Tunnel0: Ifindex = 17
Serial1/0: Ifindex = 5
Tunnel1: Ifindex = 6
GigabitEthernet0/1: Ifindex = 2
T3 1/0: Ifindex = 4
Tunnel281: Ifindex = 7
Serial1/0.103: Ifindex = 16
GigabitEthernet0/1.774-802.1Q vLAN subif: Ifindex = 18
GigabitEthernet0/1.287-802.1Q vLAN subif: Ifindex = 11
Tunnel287: Ifindex = 8
GigabitEthernet0/1.288-802.1Q vLAN subif: Ifindex = 12
GigabitEthernet0/1.938-802.1Q vLAN subif: Ifindex = 13
Tunnel288: Ifindex = 9
GigabitEthernet0/1.939-802.1Q vLAN subif: Ifindex = 19
Serial1/0.107: Ifindex = 14
Serial1/0.117: Ifindex = 15
GigabitEthernet0/1.281-802.1Q vLAN subif: Ifindex = 10
The following is what the router looks like from the perspective of NPM (notice Tunnel 1 is there but Tunnel 0 is not):
- Topology: Layer 3
- GigabitEthernet0/0 · $ETH-LAN$$ETH-SW-LAUNCH$$INTF-INFO-GE 0/0$
- GigabitEthernet0/1 - Gi0/1
- Null0 - Nu0
- T3 1/0
- Serial1/0 · **Frame Relay circuit ID
- Tunnel1 - Tu1
- Tunnel281 ·
- Tunnel287 ·
- Tunnel288 ·
- GigabitEthernet0/1.281-802.1Q vLAN subif ·
- GigabitEthernet0/1.287-802.1Q vLAN subif ·
- GigabitEthernet0/1.288-802.1Q vLAN subif ·
- GigabitEthernet0/1.938-802.1Q vLAN subif - Gi0/1.938
- Serial1/0.107 · To
- Serial1/0.117 · ** Primary PVC to
- Serial1/0.103 · Frame Relay to
- GigabitEthernet0/1.774-802.1Q vLAN subif ·
I have been instructed (in house) to try to fix the issue by removing the Tunnel 0 interface; creating a Tunnel 2; and moving the Tunnel 0 configuration over to Tunnel 2 as a workaround. This has to be done after hours and with customer notification, etc, and I really don't want to do all this without some basis to think that this fix will actually work.
So the question is "where is interface Tunnel 0".