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265 Posts
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2743
February 1st, 2011 23:00
etherchannel
hi
i have cge0 and cge1 connect to cisco switch 1
cge2 and cge3 connected to different cisco switch2
can i crate etherchannel for cge0 cge1 cge2 and cge3
what the best network configuration in this case
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bergec
275 Posts
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February 2nd, 2011 00:00
You cannot create an Etherchannel or LACP with ports connected to different switches
You could create two Etherchannel (one cge0 and cge1 to switch1 the other cge2 and cge3 to switch2) and the a Fail Safe Network (FSN) on top of those 2 Etherchannels
As for the FSN, there is a note in the documentation "Configuring and Managing Celerra Network High Availability":
If the devices of a FSN are connected to different switches, it is critical that all switch ports of the FSN be configured to immediately switch from blocking mode to forwarding mode and not pass through spanning tree states of listening and learning when an interface comes up.
On Cisco switches, this means the portfast capability must be enabled for each of the ports connected between the switch and the constituent devices of the FSN.
This is necessary to guarantee that the switch forwards the Ethernet frame that the Data Mover generates when a physical link is enabled. This is done on a port-to-port basis. The portfast variable, when enabled, causes the port to immediately switch from blocking to forwarding mode. It is important that you do not use portfast on switch-to-switch connections.
If you notice a FSN device toggling between components, it might be because a primary device is configured and the primary device is having intermittent failures
Claude
bergec
275 Posts
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February 2nd, 2011 00:00
Use "server_ifconfig server_2 -all" in order to figure out which IPs (interfaces) are configured on each "virtual device"
Claude
dynamox
9 Legend
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20.4K Posts
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February 2nd, 2011 03:00
you can if you have the appropriate switch, like Nexus 7000 with vPC
AdamFox
254 Posts
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February 2nd, 2011 06:00
Correct. This has always been a switch-side issue and the newer Cisco switches have ways to address this.
-- Adam Fox, Technical Consultant // 919-606-0911
Typed with my thumbs on a very small keyboard
Rainer_EMC
4 Operator
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8.6K Posts
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February 2nd, 2011 09:00
You can also do this with switches that support cross-stack LACP
christopher_ime
2K Posts
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February 3rd, 2011 00:00
To review your vaious options, I would recommend reviewing the document: Configuring and Managing Celerra Network High Availability which is available from PowerLink in the following path:
Home > Support > Technical Documentation and Advisories > Hardware/Platforms Documentation > Celerra Network Server > Maintenance/Administration
It will describe each of your Celerra device options, diagrams representing the physical layout for various combinations, and the steps to configure (and troubleshoot) them.
Mosa3lyan
265 Posts
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February 14th, 2011 22:00
Thanks all