07-22-2008 05:29 PM - edited 03-06-2019 12:23 AM
Hi,
Just after some "best practice" advice on the following:
We have two 3750's(3750E-24TD-S) stacked, and a 7200 w/NPE -G1 - We are wanting to connect two of the GigE ports of the NPE to both 3750's(In case one switch fails) - We currently have it setup as port-channels, which is working fine, but wanted to confirm if this was the "correct" method to achieve redundancy, and also additional bandwidth between the 3750's + 7200.
During minimal testing, we lose ~2 packets if a cable is disconnected(If the session(ping) is running over that cable) - Is there anyway to reduce this?
Any suggestions are greatly appreciated.
Current conf..
7200:
!
interface Port-channel1
description GEC_to_3750s
no ip address
duplex full
hold-queue 150 in
!
interface GigabitEthernet0/1
description TO_3750_1_0_24
no ip address
duplex full
speed auto
media-type rj45
negotiation auto
channel-group 1
!
interface GigabitEthernet0/2
description TO_3750_2_0_24
no ip address
duplex full
speed auto
media-type rj45
negotiation auto
channel-group 1
!
3750s:
interface Port-channel1
description GEC_to_7200
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet1/0/24
description TO_7200_GE_0_1
switchport trunk encapsulation dot1q
duplex full
channel-group 1 mode on
spanning-tree portfast
!
interface GigabitEthernet2/0/24
description TO_7200_GE_0_2
switchport trunk encapsulation dot1q
duplex full
channel-group 1 mode on
spanning-tree portfast
07-23-2008 12:53 AM
Your solution is basically fine. I agree that channels are a good way to make such a connection.
However, you should leave everything on "auto" including the duplex-mode. This is the recommended setup for gigabit.
Also, you should remove the portfast commands from the ports on the 3750. It does not help you here and there is no need for it.
These little adjustments might result in a slightly faster convergence but missing two pings is not too bad.
regards,
Leo
07-23-2008 03:24 PM
Thanks for the confirmation.
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