terminate the WAN link on a switch.

Answered Question
Nov 12th, 2009
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Regarding the Ethernet ports,that also available on routers .....so is there any specific criteria for choosing the WAN link type & specific bandwidth when we want to terminate the WAN link on a switch.


And also....if we want to terminate the link on a layer 3 switch...is there any extra equipment or converter required ??


Correct Answer by Jon Marshall about 7 years 4 months ago

Manjit


Yes you can do this but you would then need to configure shaping on the port on the 3750 so you do not exceed the 2Mb bandwidth - use the config guide as a starting point for shaping -


http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_46_se/configuration/guide/swqos.html


Jon

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Jon Marshall Thu, 11/12/2009 - 13:09
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Manjit


"so is there any specific criteria for choosing the WAN link type & specific bandwidth when we want to terminate the WAN link on a switch."


Not sure i follow. As long as the link is ethernet you choose the bandwidth.


"f we want to terminate the link on a layer 3 switch...is there any extra equipment or converter required ??"


Again, it needs to be presented as ethernet and you will be fine. Obviously if they present fibre you need a fibre connection on your switch. If the WAN termination is anything other than ethernet you would need some sort of intermediate device such as a router.


Jon

manjit_raulo Thu, 11/12/2009 - 13:44
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thanks Jon....


Is it possible to terminate a 2MB Ethernet WAN link on a fastethernet port of cisco 3750 switch.

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Jon Marshall Thu, 11/12/2009 - 13:50
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Manjit


Yes you can do this but you would then need to configure shaping on the port on the 3750 so you do not exceed the 2Mb bandwidth - use the config guide as a starting point for shaping -


http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_46_se/configuration/guide/swqos.html


Jon

manjit_raulo Thu, 11/12/2009 - 14:37
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Thanks Jon....


As I don't have much idea on applying qos & till now ...I never configured any qos yet.


So have to study on this particular topic.


Is there any particular link to start qos from the very basic level.


That would be very helpful.


thanks again.

mehernaz_morawala Wed, 03/07/2012 - 23:41
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Hi,


Can anyone please tell me the differnce between terminating a link on a cisco 3750X versuse an ISR G2 router?


Also, can i terminate a link of 124mbps on a switch?


Appreciate your qucik response.

Joseph W. Doherty Thu, 03/08/2012 - 06:20
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The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.


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Posting


What kind of link?  124 Mbps?


If you're thinking just Ethernet, assuming your ports supports the actual physical type of Ethernet, either should be able to terminate the link.

Joseph W. Doherty Thu, 03/08/2012 - 06:30
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The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.


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Posting


Often when dealing with WAN links with Ethernet hand-offs, they can be terminated on any devices that provides the matching physical Ethernet type.  However, as WAN links, even with Ethernet hand-offs often have less than typical LAN Ethernet (logical) bandwidths (your 2 Mbps being a case in point), LAN oriented switches often don't have the features to manage the bandwidth similarly to most routers.  For example, on a router, you might have:


interface FastEthernet 0/0

traffic-shape rate 2000000


Which shapes your rate to your 2 Mbps and WFQs traffic (a fairly effective, but simple, QoS).


Most (small) LAN switches would not offer a shaper nor FQ feature.


BTW, there's MetroEthernet switches offer enhanced features, compared to a LAN switch, but for up to about 10 Mbps, I would recommend an ISR.

mehernaz_morawala Thu, 03/08/2012 - 20:45
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Hi,


The link is a normal Ethernet 124 mbps link terminating on a 3750X 48 ports switch.

This link will only be used for Replicating data from DC to DR.


Will it now be ok to terminate on 3750X 48 port switch?

Joseph W. Doherty Fri, 03/09/2012 - 03:04
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In   no event shall Author be liable for any damages whatsoever (including,   without limitation, damages for loss of use, data or profit) arising  out  of the use or inability to use the posting's information even if  Author  has been advised of the possibility of such damage.


Posting


What's "normal" with 124 Mbps Ethernet?  I only know of Ethernet, FastEthernet, GigEthernet and 10 GigEthernet, but 124 Mbps Ethernet?  Might this be GigEthernet rate-limited to 124 Mbps?


If you're only going to send one kind of bulk data, such as replication data, then yes a 3750-X would be okay, although a router supporting RED or FRED might obtain a higher goodput rate but not enough I would worry about it.

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