Catalyst 4507R Supervisor V multiple ports to increase speed?

Unanswered Question
Jul 30th, 2009

We have a 4507R with Two Supervisors V.

We are trying to find a way to increase data speed between a server and the 4507.

We thought we can connect multiple Nic cards from server to multiple switchports. Will this increase the speed transference? If not, is there any workaround for our goal other than to buy new Supervisors?

I have this problem too.
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Giuseppe Larosa Thu, 07/30/2009 - 13:23

Hello Ezequiel,

what linecard models are on the chassis?

this makes the difference too.

E linecards support 24 Gbps connection to backplane

normal linecards only 6 Gbps to backplane.

Hope to help

Giuseppe

Zeek Ferraros Thu, 07/30/2009 - 13:25

Here you have the info

1 2 Supervisor V 1000BaseX (GBIC) WS-X4516 2 2 Supervisor V 1000BaseX (GBIC) WS-X4516

3 48 10/100/1000BaseT (RJ45) WS-X4548-GB-RJ45

5 48 10/100/1000BaseT (RJ45) WS-X4548-GB-RJ45

7 48 10/100/1000BaseT (RJ45) WS-X4548-GB-RJ45

jbrenesj Thu, 07/30/2009 - 13:29

You can do a channel between the server and the switch to "aggregate" the bandwidth of all the links and create a bigger pipe. This works but as stated above, you gotta watch out for the capabilities of the module you are using because for instance, the WS-X4548-GB-RJ45 module shares only 1 Gigabit between 8 of the front panel ports so even if you connect 8 links from the server to the switch you'll not get 8GB but only 1GB.

The trick is to use different ports.

i.e: a channel of 4 links can use

gi3/1

gi3/9

gi3/17

gi3/25

EtherChannel Between a Cisco Catalyst Switch That Runs Cisco IOS and a Workstation or Server Configuration Example:

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a008089a821.shtml

Joseph W. Doherty Thu, 07/30/2009 - 14:01

As Jorgemario descibed in his post, some host NICs can work with some switches in a port channel configuration. Not all NICs support this. Even when they do, when you port channel, you should also chose your hashing option to best distribute your traffic. Also note, single flows generally will only use one link.

Some host NICs support multiple NICs with special modes. One I recall was only one port would receive data but all others could transmit data. (This worked well for servers that sent more than they received, e.g. typical web server.)

Assuming your server NICs are already running at gig, also keep in mind, gig is getting close to typical performance levels of some disk I/O subsystems or the system bus. I.e., if you want to jump into multiple gig (or 10 gig), other server system components need to ber able to perform at that rate too, not just the NIC.

Another option to consider is moving to 10 gig, but then you are into new hardware.

All the above assumes you only need to increase bandwidth to one very busy server. However, if you have lots of really busy servers, all running with gig, it's possible you'll bump into the bandwith limitation of slots and port groups. Jorgemario also touched on this for port channeling, but even with single port server attachments, you might carefully consider how you use the ports to insure a server always gets its port gig's bandwidth.

For instance, using a 4548, you might only use one port of a group of eight to guarantee that port full gig (not shared). Or perhaps have your very busy server on one port of eight but other ports, in the same group, attached to very little bandwidth demanding hosts.

Zeek Ferraros Thu, 07/30/2009 - 14:09

Thanks for all your replies.

I think we are going to be good with our hardware for now knowing that we have the option of running up to 6GB to a single server using a full 4507 slot. And to add some more information, we are only planning to agregate bandwith to one unique busy server.

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