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Gigabit ethernet optical/electrical config difference


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#1 lamo

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Posted 08 October 2010 - 07:46 AM

Hi experts, I would like to appologize for so lame question posted here, but still...

Could you advise if it is possible to differentiate GigabitEthernet port optical from electrical on 7609 Cisco router. I mean If I have only startup-config, what is the difference in configuration (if any) between optical and electrical GigabitEthernet ports.

Thank you in avance and once again sorry

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#2 Darby Weaver

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Posted 08 October 2010 - 09:10 AM

You mean if you are using say an Optical interface versus a physical Ethernet Interface...?

Hmm...

The difference between the OSM - optical interfaces and the copper Ethernet interfaces have to do with:

1. The physical layer

2. Some of the features that one might have versus the other.

Now with that said...

This is the config on the OSM:

interface GE-WAN9/1
bandwidth 50000
ip address x.x.x.9 255.255.255.252
ip pim sparse-mode
no negotiation auto
mls qos trust dscp
service-policy output AJA

This is another OSM interface with a subinterface configured:

interface GE-WAN9/4.111
description Metro E
bandwidth 50000
encapsulation dot1Q 111
ip address x.x.x.x 255.255.255.0
ip pim sparse-mode
mls qos trust dscp
service-policy output AKA

This is a copper Ethernet interface:

interface GigabitEthernet1/1
description ** Link to 3845 G0/1 **
ip address x.x.x.x 255.255.255.252
ip pim sparse-mode
speed 1000
duplex full
mls qos trust dscp
end



All of these are on a Catatlyst 6500 Series Switch.

Not much difference config-wise.

Darby

http://www.darbyslogs.blogspot.com

Edited by Darby Weaver, 08 October 2010 - 09:12 AM.

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#3 lamo

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Posted 08 October 2010 - 05:04 PM

Thank you very much for your reply ...
just to confirm... if I see lets say GigabitEthernet 1/1 then I am safe to say that this is electrical (just a copper wire). And the difference between is only naming conventions. Is it correct ?
Or GigabitEthernet 1/1 also can be optical ???

Best regards

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#4 lamo

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Posted 08 October 2010 - 05:47 PM

I mean to say that in case of not WAN interfaces but simple board with 1 G SFP tranceivers we also will get naming convention like GigabitEthernet 1/1 and not GE-WAN9/x. Please crrect me if I am wrong. Probably I just cannot explain myself well. So just summary of the question is that:

Can GigabitEthernet 1/1 be an optical interface or it is definitely copper ?

Thank you in avance for prompt response and

Best regards

Lame

Edited by lamo, 08 October 2010 - 06:08 PM.

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#5 Darby Weaver

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Posted 08 October 2010 - 07:40 PM

In my case:

1. GE-WAN9/x is an optical interface. It is optical.

2. GigabitEthernet1/1 is copper as is WS-X6748-GE-TX it could easily be a WS-6516 with Fiber 5458 GBICs or even the WS-X6724 with Gigabit SFPs...

The config is essentially the same.

There is a difference!!!!!!!!!!!!

In the OSM Blade (Only 4 ports in my case per chassis) it also supports QoS functions as a router not as a switch. That is a HUGE difference. Have you ever used a Flex-WAN module in a 6500 chassis before - basically a module that takes PA-XXX modules from a 7200/7500 series router.

The OSM (optical) ports work, taste, and feel like a router - the best place to demonstrate this is with QoS.


Hope that helps.

Otherwise most of the config is not really that different at all.
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#6 lamo

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Posted 08 October 2010 - 08:14 PM

Hi,

Thank you very much it helped.
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#7 Darby Weaver

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Posted 09 October 2010 - 04:16 AM

Any time!
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