10-13-2006 06:26 AM - edited 03-05-2019 12:14 PM
We are trying to combine four gigE ports from a 4948 to a server with an Intel quad gigE nic so that we have 4 gbps throughput.
We have tried both etherchannel and LACP. The max throughput we can achieve is 1 gpbs. Almost all of the traffic is going through nic #4.
Then I noticed that when we do a sho int port-channel xx that the speed for the port-channel is 1000 mbps. I tried changing bandwidth in the port-channel interface and that did not help.
What are we doing wrong?
Running Version 12.2(25)EWA4
here is the config:
interface Port-channel31
description etherchannel down to stream 29 interface 20 22 24 26
bandwidth 10000000
ip address 1.2.3.153 255.255.255.248
duplex full
!
interface GigabitEthernet1/20
description stream 29 etherchannel 29 A
no switchport
no ip address
logging event link-status
duplex full
no cdp enable
channel-protocol lacp
channel-group 31 mode active
interface GigabitEthernet1/26
description stream 29 etherchannel 29 D
no switchport
no ip address
no ip redirects
no ip unreachables
logging event link-status
duplex full
no cdp enable
channel-protocol lacp
channel-group 31 mode active
end
and as I said above, the port-channel shows a 1000 mbps speed
sh int port-channel 31
Port-channel31 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 0018.73b1.0f3f (bia 0018.73b1.0f3f)
Description: etherchannel down to stream 29 interface 20 22 24 26
Internet address is 1.2.3.153/29
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is N/A
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi1/20 Gi1/22 Gi1/24 Gi1/26
========================================
And when we try it with etherchannel:
interface Port-channel27
description etherchannel down to stream 27 interface 12 14 16 18
ip address 1.2.3.65 255.255.255.240
duplex full
end
interface GigabitEthernet1/12
description stream 27 etherchannel 27 A
no switchport
no ip address
logging event link-status
duplex full
channel-group 27 mode active
nterface GigabitEthernet1/18
description stream 27 etherchannel 27 D
no switchport
no ip address
logging event link-status
duplex full
channel-group 27 mode active
sho int port-channel 27
Port-channel27 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 0018.73b1.0f3f (bia 0018.73b1.0f3f)
Description: etherchannel down to stream 27 interface 12 14 16 18
Internet address is 1.2.3.65/28
MTU 1500 bytes, BW 4000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is N/A
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi1/12 Gi1/14 Gi1/16 Gi1/18
What are we missing?
10-13-2006 09:18 AM
Is the etherchannel actually working ? show etherchannel detail . If you look at the port channel it says BW 4000000 Kbit . You have to remember this is a little misleading because even though you have 4 gig of potential bandwidth any 1 conversation will only have access to one gig total . Etherchannel is more of a bandwidth sharing function as traffic gets balanced across all 4 links based on a algorithim based on the mac address I believe . So traffic is basically balanced across all 4 links based on either the mac address or the source or destination ip address , so any 1 conversation will always use the same link so it has access to 1 gig for that conversation along with whoever else happens to be using that link at the same time.
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