07-20-2009 06:56 AM - edited 03-04-2019 05:29 AM
Hello,
We would like to set up a 200Mbps link between two remote sites of our company changes sites are equipped with router cisco 3845. FH link connecting the two sites proposed interfaces separate 100Mbps each.
We explored the idea of making EtherChannel on both sides on the routers but it does not work. The ospf does not work.
We thank you for making proposals.
Below is a copy of the configuration of routers
!
!
interface Port-channel1
switchport access vlan 100
!
!
interface FastEthernet3/0
description *** Vers A ***
switchport access vlan 100
bandwidth 100000
duplex full
speed 100
channel-group 1 mode on
!
interface FastEthernet3/1
description *** Vers A ***
switchport access vlan 100
bandwidth 100000
duplex full
speed 100
channel-group 1 mode on
!
!
interface Vlan100
description *** Interco vers A ***
ip address 10.X.X.75 255.255.255.252
ip ospf network point-to-point
ip ospf hello-interval 1
!
Thank you for your help
07-20-2009 07:07 AM
Hi,
Check your MTU on both end of the link, OSPF will not come up if MTU are different.
show ip ospf interface
HTH,
jerry
07-20-2009 08:25 AM
Hello
I just checked we have the same MTU on both routers.
I note that the OSPF working between the two routers using only a 100Mbps link
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
We have the some config.
Thinks for your help
07-20-2009 08:33 AM
Hi,
What type of module you are using on the 3800? Also have you check with your carrier to see they allow you to do EC?
HTH,
jerry
07-20-2009 09:26 AM
Hi,
I used th module NM-16ESW-1GIG
Thanks you
07-20-2009 09:43 AM
Can you post the output of the following command?
show ether sum
show run | b router ospf
show ip ospf int
Regards,
jerry
07-20-2009 10:13 AM
Hello Gatien,
OSPF supports equal cost path load balancing by default I would use the two links as L3 parallel links
Specially between routers.
However, I see that you say these ports are taken from etherswitch module so the bundle makes sense.
So I would try to use a L3 port-channel giving IP address to logical port-channel interface.
also try to use
debug ip ospf adj.
Another note:
have you created the L2 Vlan corresponding to the SVI you are using?
Depending on the etherswitch model you may need to do this in vlan database mode
also the SVI needs to be unshutted manually.
Hope to help
Giuseppe
07-20-2009 07:30 AM
How does the OSPF configs looks like?
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