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05-26-2011 02:06 PM
05-26-2011 02:06 PM
I want to configure a link aggregation with LACP between a CEntos Server and a HP 5800 with Version 5.20, Release 1206.
I think there is a problem with the load sharing method in the switch beacause I have connectivity with the server when I have only on link enabled. When I've got the 2 links enabled I can't reach the server with a ping, but in the server I can sniff traffic from the switch.Furthermore, when I configure "link-aggregation load-sharing mode source-ip destination-ip" I can reach the server with 7 pings, after the 7 ping I can't reach again.
I paste below the configuration of the switch:
interface Bridge-Aggregation2
description CEntOS_Server
#
interface GigabitEthernet1/0/19
port link-mode bridge
port link-aggregation group 2
#
interface GigabitEthernet1/0/20
port link-mode bridge
port link-aggregation group 2
Solved! Go to Solution.
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05-27-2011 10:55 AM - edited 05-27-2011 10:58 AM
05-27-2011 10:55 AM - edited 05-27-2011 10:58 AM
Re: A5800 link aggragation
Remove all the Interface Bridge settings, disconnect the cables from the ports. Then try to enter this template:
interface bridge 2
interface GigabitEthernet1/0/19
port link-aggregation group 2
interface GigabitEthernet1/0/20
port link-aggregation group 2
interface bridge 2
description CEntOS_Server
port link-mode bridge
Re-connect the cables and watch if the bridge-interface is up. Use the display link-aggregation verbose to check the aggregation group status. Make a double check in the server settings, some servers uses the LACP to bind interfaces. If this is necessary you will need to enable LACP in the bridge-interface too, using the command link-aggregation mode dynamic.
A few days ago I faced a similar problem; when I tried to set up the LAG in this way the aggregated link started to work. This occurs because the Bridge-aggregation interface acts as the main interface, reflecting all the settings in the selected ports of its link-aggregation group.
If you enter any command straight in the ports, not in the virtual bridge-aggregation port, the communication goes down. This is a particularity of v.5 software, that in this features acts as the Etherchannel (interface port-channel) in Cisco switches.
HTH.
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05-30-2011 06:03 AM
05-30-2011 06:03 AM
Re: A5800 link aggragation
I have done all steps but I have the same problem.
When the LAG is established it only works with load-sharing mode ="source-ip destination-ip" and I can reach only some IPs.
When I have only one link working in the LAG (shut down the other interface in the server), I can reach all IPs in the network.
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05-31-2011 11:03 AM
05-31-2011 11:03 AM
SolutionThis is really weird. I already did these settings with LAG in the v.3 and v.5 and didn't have problems. Make a double check in the server settings; which binding method are you using in the server setup? Teaming or something like that? Did you tried to setup the bridge-aggregation without the load-sharing mode?
In my expertise with this feature, all the server settings were always responsible by manage the load-share itselves, the switch just manage the L2 connections, nothing else. Are you using multicast in the server?
Regards
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05-31-2011 02:02 PM
05-31-2011 02:02 PM
Re: A5800 link aggragation
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05-31-2011 02:03 PM
05-31-2011 02:03 PM
Re: A5800 link aggragation
I have solved using "link-aggregation mode dynamid"
Thanks
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05-31-2011 11:06 PM
05-31-2011 11:06 PM
Re: A5800 link aggragation
I know you've solved the problem, but i thought i'd mention one point about this: you don't actually NEED switch-based link aggregation with Linux servers. With the Linux bonding driver many of the options are available without configuring anything on the switch. See http://www.howtoforge.com/nic-bonding-on-debian-lenny for more information (the link is specific to Debian, but the same options are available on CentOS as well).
Paul
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06-01-2011 12:37 AM
06-01-2011 12:37 AM
Re: A5800 link aggragation
I know that you say about bonding, but the linux server was only used to test without network disruption.
I have a Procurve 5406zl with 3 gb links to the same switch, and I want to do a 3 gb LAG between both switches.
I attach you a simple schematic.
Thanks for your help
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