11-21-2006 04:10 AM - edited 03-05-2019 12:56 PM
Is it possible to create an EtherChannel connection between a 3750 stack (2 members) and the onboard LAN interfaces in a 2811?
If yes, could you point me to some doc / configuration examples?
Solved! Go to Solution.
11-27-2006 04:33 AM
Hi KEITH,
Just got the answer on this for you.
Ether-channel is not supported on 2800 routers on the builtin FE ports. Its only supported on the etherswitch modules and the network modules on the routers.
Here is a bug for the same:
http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCin55942
HTH, Please rate if it does.
-amit singh
11-21-2006 04:21 AM
FYI - I have attempted a configuration based on the following, but with no luck so far;
11-21-2006 04:58 AM
should work I would think , make sure the native vlan matches on each of the link .
11-21-2006 04:22 AM
Go through the below links,
For Cisco IOS
http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094958.shtml
For CatIOS
http://cio.cisco.com/univercd/cc/td/doc/produ
ct/lan/cat6000/sw_6_3/confg_gd/channel.htm
Regards,
Suresh Jain
11-21-2006 06:11 AM
11-21-2006 06:16 PM
Explanation of what doesn't work;
* EIGRP neighbors not being discovered between the Router and the Switch.
-- The switch does receive an EIGRP Hello, but route exchange and ACKS are not seen
-- The router never sees an EIGRP Hello from the switch
What does work;
* Interfaces are Up / Up on both sides
* Port-Channel up on both sides
* CDP neighbors seen both sides
So, what is not working is routing in this configuration.
If I use ports on the EtherSwitch module in the 2811 instead, I am able to get an EtherChannel configuration working between the switch and router.
What I am trying to understand is why I am not able to use the onboard Ethernet interfaces (FA0/0 & FA0/1) to accomplish this.
Thanks to anyone who can help educate me on this one.
11-21-2006 09:05 PM
The only that we can make out of the configs is that 3750 ports are bundeled on layer2 ether-channel. While the routers ports ate bundeled on a layer 3 ether-channel.
I would suggest you take create a L3 port-channel on 3750 as well. Make the two bundeled ports as layaer 2 ports using "no switchport" under the interface and bundeled them to a layer-3 portchaneel with an IP address on it.
Let us know your findings on it.
-amit singh
11-22-2006 03:35 AM
Thanks for your response - Still no luck :(
Any other thoughts?
###### SWITCH CONFIG ######
interface Port-channel1
no switchport
ip address 10.120.255.45 255.255.255.252
interface GigabitEthernet1/0/24
no switchport
no ip address
duplex full
speed 100
channel-group 1 mode on
interface GigabitEthernet2/0/24
no switchport
no ip address
duplex full
speed 100
channel-group 1 mode on
router eigrp 10499
redistribute connected
network 10.120.0.0 0.3.255.255
no auto-summary
###### ROUTER CONFIG ######
!
interface Port-channel1
no ip address
hold-queue 150 in
!
interface Port-channel1.44
encapsulation dot1Q 1 native
ip address 10.120.255.46 255.255.255.252
no snmp trap link-status
!
interface FastEthernet0/0
no ip address
duplex full
speed 100
channel-group 1
!
interface FastEthernet0/1
no ip address
duplex full
speed 100
channel-group 1
router eigrp 10499
redistribute connected
network 10.120.0.0 0.3.255.255
no auto-summary
###### RESULTS ######
NO ROUTING ACROSS Port-Channel Interfaces
>> Both sides see CDP neighbors
>> Switch receives EIGRP HELLO and UPDATE - but no ACK
>> Router not receiving EIGRP updates - sends HELLOS on Port-Channel1.44, but nothing back
**>> also tried the above config with 1 difference on router - no subinterface 1.44 and IP address on Port-Channel itself (same results)
11-22-2006 09:36 AM
Hi,
Let the router be on port-channel only. Dont create the sub-interface for it.
Once done that, please paste the output of " show port-channel " from both the devices. Also attach the config for both the devices.
Can you ping the port-channel interfaces from either of the side?
Try to get some debugs for eigrp adjacency.
-amit singh
11-22-2006 04:55 PM
Hi,
I am out of the office for the Thanksgiving holiday, returning on Monday. If time permits, I will go into the office and get this information before then.
Thank you and please check back.
11-24-2006 11:29 AM
11-24-2006 02:02 PM
Are the 2 router ports on a HWIC ? If so you it won't support it . Here is a blurb from the card specs .
A. The Cisco EtherSwitch network modules and service modules support Cisco EtherChannel technology, including the Gigabit Ethernet ports. Up to eight ports with the same speed and duplex can be aggregated into a single channel group. The Cisco EtherSwitch HWICs do not support Cisco EtherChannel technology. If both a network module and an HWIC are used, the network module interfaces can be configured for Cisco EtherChannel technology, but those on the HWIC cannot.
11-24-2006 02:21 PM
No, these are the 2 on-board ethernet ports FE0/0 and FE0/1.
11-24-2006 08:49 PM
Hi,
After looking the debugs from both the sides I have oberseverd one thing that 3750 is sending the routing updates to router but router is not sending back the "Ack" to the 3750.2811 router is neither enqueuing any updates to send it to the 3750. Check the requence number and flags in the debugs.
One thing I have just notice the " hold-queue 0 in" command under the port-channel interface. Why that command it given there?. AFAIK this vlaue cannot be zero. This will prevent the router from sending the updates on the port-channel interface. Try removing this command and let us know your findings.
HTH,
-amit singh
11-25-2006 06:27 AM
Hi,
Made the changes but still no luck - same results. I'm really beginning to think this will not work.
If I make each interface (fa0/0 & fa0/1) separate layer 3 point to point interfaces, I am able to have redundant links back to the core switch. Either that or create a Layer 3 port-channel using ports on the switch module in the router work also.
What I was really hoping to end up with was a single Layer 3 interface using the "on-board" router interfaces for redundancy \ speed.
Any other ideas or is this looking like a dead horse?
I sure appreciate your feedback and help.
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