07-26-2011 12:16 PM - edited 03-07-2019 01:25 AM
I need a little assistance as we are looking into designing a Disaster Recovery site and are in the process of designing it. We have 2 1 gig fiber links
being handed to us for the connection back to the HQ location. The problem is, how do I terminate these 2 fiber links to provide a full 2 gig connection back to the Headquarters location? This is where I thought we could possibly do a port-channel with 2 of the interfaces located on the ASR 1002 router, however, I'm not sure this I can do port-channels from a switch to a router. I'm able to get the port-channel to come up, but I can't seem to get traffic to pass (unable to ping across it). In addition to this location, we will also be putting in a nexus 5k/2k deployment as well. Upon considering terminating the port-channel to the 5k, we don't believe we would be able to perform the GRE and CRYPTO tunnels by doing it this way. And since we would be moving across a foreign network to get back to our HQ, we want the GRE and Crypto options.
Again, I did try to set up the portchannel from switch to router locally and was able to get all links up, Upon showing the port-channel information, it showed the combined bandwidth of the two links. Unfortunately, I just couldn't get a ping across it. I didn't understand this and am looking for some assistance.
Any assistance would be appreciated.
Thanks in advance!!
07-26-2011 12:36 PM
Why not do it the old fashion way - run a dynamic routing protocol over the two links that supports multi path load sharing? EIGRP/OSPF
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07-26-2011 01:57 PM
Can you post some configuration output, I'd be happy to look at it and see if I notice any misconfigurations. There should be no issues running a PC between a router and a switch.
I'd recommend using LACP (channel-group XX mode active) on each side.
07-27-2011 12:10 AM
AFAIK;-
1) Routers can form Port-Channels, only if you have a switching module in the device; not support on normal FE/GIG
2) They do not support PAgP or LACP protocol negotiation.
07-27-2011 05:20 AM
The ASR 1k supports Port-Channels on L3 interfaces IIRC, and does support LACP. However you are correct in stating that it does not support PAGP.
07-27-2011 05:57 AM
ASR pertinent information::
int port-channel 20
ip address x.x.x.x y.y.y.y
int g0/0/0
channel group 20
speed 1000
duplex full
int g0/0/1
channel group 20
speed 1000
duplex full
3750 pertinent information:
int port-channel 20
ip address x.x.x.x y.y.y.y
int g0/0
channel group 20 mode on
speed 1000
duplex full
int g0/1
channel group 20 mode on
speed 1000
duplex full
On the ASR side, i'm unable to state that I want to turn the mode to active, it only allows me to enter 'channel-group 20' and thats it. The syntax doesn't allow anything after the '20'.
07-27-2011 06:01 AM
on the 3750 side have you tried "no switchport" under in port-channel 20 ??
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