No tunnels configured, but frequent log messages, "%LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel1, changed state to up"
ASR 1002 running 12.2(33)XND3. We're seeing the %LINEPROTO-5-UPDOWN log message every 5 to 15 minutes, always "changed state to up" despite there never having been any tunnel interface configured on the box.
Additionally, we do get output from the "show interface tunnel1" command:
CADBEWEFMP650#sh int tu1 Tunnel1 is up, line protocol is up Hardware is Tunnel Interface is unnumbered. Using address of GigabitEthernet0/0/0.1 (10.137.3.178) MTU 17872 bytes, BW 100 Kbit, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 10.137.3.178 (GigabitEthernet0/0/0.1), destination 184.108.40.206 Tunnel protocol/transport PIM/IPv4, key Tunnel TOS/Traffic Class 0xC0, Tunnel TTL 255 Tunnel transport MTU 1480 bytes Tunnel transmit bandwidth 8000 (kbps) Tunnel receive bandwidth 8000 (kbps) Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/0 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out CADBEWEFMP650#
Clearly, I'm missing something here. Could this perhaps be some sort of tunnel that is dynamically created, without requiring actual configuration?
I see the same issue, but i have ip multicast-routing (ipv4) configured.
%LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up
Seeing the above message continuously. Is this can be ignored as the PIM register process?
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