Etherchannel between switch and router

You turned etherchannel without any LACP oraz PAgP negotiation. Maybe this is the trick. Check output of "show int portchannel" on the router. If there are no expected members, try other negotiation modes on Cat3750 : desirable or active.

Dariusz Pazdzior

Uzytkownik napisal w wiadomosci news: snipped-for-privacy@t31g2000cwb.googlegroups.com...

Cisco routers do not support PAgP or LACP and so setting the mode to "on" on the switch side is correct. One thing I see is that you have " vlan dot1q tag native" on the switch. This will cause the native VLAN packets to be tagged and maybe this is confusing the router. Could you try and remove that configuration from the switch and see if it helps?

If it does not help, could you post the output from "show int port-channel" from both the router and the switch?

Cisco da Gama

Thanks for your replies. Sorry for the delay...many fires to put out!

So I did remove the native vlan info, and no go. here are the show int from the router and switch.

3750

- - - - - -

Port-channel15 is up, line protocol is up (connected) Hardware is EtherChannel, address is 0017.5913.2281 (bia

0017.5913.2281) MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Full-duplex, 1000Mb/s, link type is auto, media type is unknown input flow-control is off, output flow-control is unsupported Members in this channel: Gi1/0/1 Gi2/0/1 ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:01, 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 245000 bits/sec, 291 packets/sec 5 minute output rate 802000 bits/sec, 1329 packets/sec 118918 packets input, 12532272 bytes, 0 no buffer Received 15950 broadcasts (0 multicast) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 15945 multicast, 0 pause input 0 input packets with dribble condition detected 531307 packets output, 40176221 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

2811

- - - - - -

Port-channel15 is up, line protocol is up Hardware is GEChannel, address is 0017.0e4e.04d0 (bia 0017.0e4e.04d0) Description: EtherChannel to 3750 MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set Keepalive set (10 sec) Unknown duplex, Unknown Speed, media type is unknown media type output flow-control is unsupported, input flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 No. of active members in this channel: 2 Member 0 : GigabitEthernet0/0 , Full-duplex, 1000Mb/s Member 1 : GigabitEthernet0/1 , Full-duplex, 1000Mb/s No. of Non-active members in this channel: 0 Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/150/0/0 (size/max/drops/flushes); Total output drops:

0 Queueing strategy: fifo Output queue: 0/80 (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 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 0 input packets with dribble condition detected 12 packets output, 774 bytes, 0 underruns 0 output errors, 0 collisions, 0 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

Port-channel15.1 is up, line protocol is up Hardware is GEChannel, address is 0017.0e4e.04d0 (bia 0017.0e4e.04d0) Internet address is 192.168.200.1/24 MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation 802.1Q Virtual LAN, Vlan ID 200. ARP type: ARPA, ARP Timeout 04:00:00 Last clearing of "show interface" counters never

I would try and hard set the speed and duplex on both sides and I would always make a habit of doing that; it clears up a lot of problems.

I would try and hard set the speed and duplex on both sides and I would always make a habit of doing that; it clears up a lot of problems.

I tried this with the result being no change.

Take another look at the configuration of the switch and router.

On the switch: interface Vlan1 ip address 192.168.200.2 255.255.255.0

On the router: interface Port-channel15.1 encapsulation dot1Q 1 native ip address 192.168.200.1 255.255.255.0 no snmp trap link-status

The show interface command shows:

Port-channel15.1 is up, line protocol is up Hardware is GEChannel, address is 0017.0e4e.04d0 (bia

0017.0e4e.04d0) Internet address is 192.168.200.1/24 MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation 802.1Q Virtual LAN, Vlan ID 200.