line protocol for tunnel interface is down
I have a following physical topology: C1841[Fa0/0] <-> [Fa1/0/1]ME-C3750-24TE. Both in C1841 and ME-C3750-24TE there is a tunnel configured:
The problem is, that while line protocol of Tu0 in ME-C3750-24TE is up, it is down in C1841:
Tunnel destinations are reachable:
Any ideas why line protocol of Tu0 in C1841 router is down?
I have a following physical topology: C1841[Fa0/0] <-> [Fa1/0/1]ME-C3750-24TE. Both in C1841 and ME-C3750-24TE there is a tunnel configured:
The problem is, that while line protocol of Tu0 in ME-C3750-24TE is up, it is down in C1841:
Tunnel destinations are reachable:
Any ideas why line protocol of Tu0 in C1841 router is down?
//I disabled keepalives under ME-C3750-24TE interface Tu0 configuration in order to avoid confusion and ran GRE debugging in C1841 and ME-C3750-24TE:
Keepalives under C1841 Tu0 are enabled. Results are following:
Cisco C1841:
Cisco ME-C3750-24TE:
Looks like the ME-C3750-24TE does not reply to GRE keepalives?
C1841#sh run int Tu0 Building configuration... Current configuration : 150 bytes ! interface Tunnel0 ip unnumbered FastEthernet0/1 keepalive 5 3 tunnel source FastEthernet0/0 tunnel destination 10.10.10.1 tunnel checksum end C1841# ME-C3750-24TE#sh run int Tu0 Building configuration... Current configuration : 134 bytes ! interface Tunnel0 ip unnumbered Vlan100 keepalive 5 3 tunnel source Vlan200 tunnel destination 10.10.10.2 tunnel checksum end ME-C3750-24TE#
The problem is, that while line protocol of Tu0 in ME-C3750-24TE is up, it is down in C1841:
ME-C3750-24TE#sh int Tu0
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Interface is unnumbered. Using address of Vlan100 (192.168.2.2)
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive set (5 sec), retries 3
Tunnel source 10.10.10.1 (Vlan200), destination 10.10.10.2
Tunnel protocol/transport GRE/IP, key disabled, sequencing disabled
Tunnel TTL 255
Checksumming of packets enabled
Last input 00:00:02, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 10
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
1689 packets input, 94576 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
1730 packets output, 96880 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
ME-C3750-24TE#
C1841#sh int Tu0
Tunnel0 is up, line protocol is down
Hardware is Tunnel
Interface is unnumbered. Using address of FastEthernet0/1 (192.168.1.2)
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive set (5 sec), retries 3
Tunnel source 10.10.10.2 (FastEthernet0/0), destination 10.10.10.1
Tunnel protocol/transport GRE/IP
Key disabled, sequencing disabled
Checksumming of packets enabled
Tunnel TTL 255
Fast tunneling enabled
Tunnel transmit bandwidth 8000 (kbps)
Tunnel receive bandwidth 8000 (kbps)
Last input 00:00:02, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 8
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
1691 packets input, 94696 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
1700 packets output, 95192 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
C1841#
Tunnel destinations are reachable:
C1841#sh ip int bri Interface IP-Address OK? Method Status Protocol FastEthernet0/0 10.10.10.2 YES manual up up FastEthernet0/1 192.168.1.2 YES manual up up Tunnel0 192.168.1.2 YES TFTP up down C1841#ping 10.10.10.1 source 10.10.10.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds: Packet sent with a source address of 10.10.10.2 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms C1841# ME-C3750-24TE#sh ip int bri | i Vlan|Tu Vlan1 unassigned YES unset administratively down down Vlan100 192.168.2.2 YES manual up up Vlan200 10.10.10.1 YES manual up up Tunnel0 192.168.2.2 YES unset up up ME-C3750-24TE#ping 10.10.10.2 source 10.10.10.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds: Packet sent with a source address of 10.10.10.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms ME-C3750-24TE#
Any ideas why line protocol of Tu0 in C1841 router is down?
I have a following physical topology: C1841[Fa0/0] <-> [Fa1/0/1]ME-C3750-24TE. Both in C1841 and ME-C3750-24TE there is a tunnel configured:
C1841#sh run int Tu0 Building configuration... Current configuration : 150 bytes ! interface Tunnel0 ip unnumbered FastEthernet0/1 keepalive 5 3 tunnel source FastEthernet0/0 tunnel destination 10.10.10.1 tunnel checksum end C1841# ME-C3750-24TE#sh run int Tu0 Building configuration... Current configuration : 134 bytes ! interface Tunnel0 ip unnumbered Vlan100 keepalive 5 3 tunnel source Vlan200 tunnel destination 10.10.10.2 tunnel checksum end ME-C3750-24TE#
The problem is, that while line protocol of Tu0 in ME-C3750-24TE is up, it is down in C1841:
ME-C3750-24TE#sh int Tu0
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Interface is unnumbered. Using address of Vlan100 (192.168.2.2)
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive set (5 sec), retries 3
Tunnel source 10.10.10.1 (Vlan200), destination 10.10.10.2
Tunnel protocol/transport GRE/IP, key disabled, sequencing disabled
Tunnel TTL 255
Checksumming of packets enabled
Last input 00:00:02, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 10
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
1689 packets input, 94576 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
1730 packets output, 96880 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
ME-C3750-24TE#
C1841#sh int Tu0
Tunnel0 is up, line protocol is down
Hardware is Tunnel
Interface is unnumbered. Using address of FastEthernet0/1 (192.168.1.2)
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive set (5 sec), retries 3
Tunnel source 10.10.10.2 (FastEthernet0/0), destination 10.10.10.1
Tunnel protocol/transport GRE/IP
Key disabled, sequencing disabled
Checksumming of packets enabled
Tunnel TTL 255
Fast tunneling enabled
Tunnel transmit bandwidth 8000 (kbps)
Tunnel receive bandwidth 8000 (kbps)
Last input 00:00:02, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 8
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
1691 packets input, 94696 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
1700 packets output, 95192 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
C1841#
Tunnel destinations are reachable:
C1841#sh ip int bri Interface IP-Address OK? Method Status Protocol FastEthernet0/0 10.10.10.2 YES manual up up FastEthernet0/1 192.168.1.2 YES manual up up Tunnel0 192.168.1.2 YES TFTP up down C1841#ping 10.10.10.1 source 10.10.10.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds: Packet sent with a source address of 10.10.10.2 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms C1841# ME-C3750-24TE#sh ip int bri | i Vlan|Tu Vlan1 unassigned YES unset administratively down down Vlan100 192.168.2.2 YES manual up up Vlan200 10.10.10.1 YES manual up up Tunnel0 192.168.2.2 YES unset up up ME-C3750-24TE#ping 10.10.10.2 source 10.10.10.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds: Packet sent with a source address of 10.10.10.1 !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms ME-C3750-24TE#
Any ideas why line protocol of Tu0 in C1841 router is down?
//I disabled keepalives under ME-C3750-24TE interface Tu0 configuration in order to avoid confusion and ran GRE debugging in C1841 and ME-C3750-24TE:
C1841#show debugging General-purpose tunnel: Tunnel Interface debugging is on Tunnel keepalive debugging is on C1841# ME-C3750-24TE#show debugging General-purpose tunnel: Tunnel Interface debugging is on Tunnel keepalive debugging is on ME-C3750-24TE#
Keepalives under C1841 Tu0 are enabled. Results are following:
Cisco C1841:
C1841# *Jul 27 11:21:58.574: Tunnel0: sending keepalive, 10.10.10.1->10.10.10.2 (len=28 ttl=255), counter=5 *Jul 27 11:21:58.574: Tunnel0: GRE/IP encapsulated 10.10.10.2->10.10.10.1 (linktype=7, len=56) C1841# *Jul 27 11:22:03.574: Tunnel0: sending keepalive, 10.10.10.1->10.10.10.2 (len=28 ttl=255), counter=6 *Jul 27 11:22:03.574: Tunnel0: GRE/IP encapsulated 10.10.10.2->10.10.10.1 (linktype=7, len=56) C1841# *Jul 27 11:22:08.574: Tunnel0: sending keepalive, 10.10.10.1->10.10.10.2 (len=28 ttl=255), counter=7 *Jul 27 11:22:08.574: Tunnel0: GRE/IP encapsulated 10.10.10.2->10.10.10.1 (linktype=7, len=56) C1841# *Jul 27 11:22:13.574: Tunnel0: sending keepalive, 10.10.10.1->10.10.10.2 (len=28 ttl=255), counter=8 *Jul 27 11:22:13.574: Tunnel0: GRE/IP encapsulated 10.10.10.2->10.10.10.1 (linktype=7, len=56) C1841#
Cisco ME-C3750-24TE:
ME-C3750-24TE# 04:17:41: Tunnel0: GRE/IP (PS) to decaps 10.10.10.2->10.10.10.1 (tbl=0,"default" len=56 ttl=255) 04:17:41: Tunnel0: GRE decapsulated IP packet (linktype=7, len=2[IMG]https://us.v-cdn.net/6030959/uploads/images/smilies/icon_cool.gif[/IMG] ME-C3750-24TE# 04:17:46: Tunnel0: GRE/IP (PS) to decaps 10.10.10.2->10.10.10.1 (tbl=0,"default" len=56 ttl=255) 04:17:46: Tunnel0: GRE decapsulated IP packet (linktype=7, len=2[IMG]https://us.v-cdn.net/6030959/uploads/images/smilies/icon_cool.gif[/IMG] ME-C3750-24TE# 04:17:51: Tunnel0: GRE/IP (PS) to decaps 10.10.10.2->10.10.10.1 (tbl=0,"default" len=56 ttl=255) 04:17:51: Tunnel0: GRE decapsulated IP packet (linktype=7, len=2[IMG]https://us.v-cdn.net/6030959/uploads/images/smilies/icon_cool.gif[/IMG] ME-C3750-24TE# 04:17:56: Tunnel0: GRE/IP (PS) to decaps 10.10.10.2->10.10.10.1 (tbl=0,"default" len=56 ttl=255) 04:17:56: Tunnel0: GRE decapsulated IP packet (linktype=7, len=2[IMG]https://us.v-cdn.net/6030959/uploads/images/smilies/icon_cool.gif[/IMG] ME-C3750-24TE#
Looks like the ME-C3750-24TE does not reply to GRE keepalives?
Comments
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Mrock4
Banned Posts: 2,359 ■■■■■■■■□□
Can you post the physical port (f1/0/1 I believe) config on your ME-3750? -
m4rtin
Member Posts: 170
Can you post the physical port (f1/0/1 I believe) config on your ME-3750?
ME-3750 configuration is here:ME-C3750-24TE#sh run int Fa1/0/1 Building configuration... Current configuration : 111 bytes ! interface FastEthernet1/0/1 switchport access vlan 200 switchport mode access spanning-tree portfast end ME-C3750-24TE#sh int Fa1/0/1 FastEthernet1/0/1 is up, line protocol is up (connected) Hardware is Fast Ethernet, address is 0011.21a3.0103 (bia 0011.21a3.0103) MTU 1998 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 10/100BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:53, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 82222 packets input, 6555044 bytes, 0 no buffer Received 21 broadcasts (4631 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 4631 multicast, 0 pause input 0 input packets with dribble condition detected 213815 packets output, 17571220 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped out ME-C3750-24TE#