CCVP lab with frame switch

Answered Question
Dec 17th, 2007
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I want to have a good frame switch. I saw some Cisco 2521 routers on EBAY for very cheap. Can I use one of those?


Correct Answer by ccbootcamp about 9 years 3 months ago

On some serial interfaces, yes, you can set the clock rate higher. On the NM-4A/S which we use, no, 128kbps is the highest clock rate it will take. Same thing with 2 of the 4 ports on the 2521 you are looking at purchasing (it has 2 low speed serial ports and 2 high speed serial ports).


-brad

www.ccbootcamp.com

(please rate the post if this helps!)


Correct Answer by ccbootcamp about 9 years 3 months ago

Here ya go:


---------------

frame-relay switching


interface Serial1/1

description FR to BR1

no ip address

encapsulation frame-relay IETF

no fair-queue

clock rate 128000

no dce-terminal-timing-enable

frame-relay lmi-type ansi

frame-relay intf-type dce

frame-relay route 101 interface Serial1/3 201

no shut

!

interface Serial1/2

description FR to BR2

no ip address

encapsulation frame-relay IETF

clock rate 128000

no dce-terminal-timing-enable

frame-relay lmi-type ansi

frame-relay intf-type dce

frame-relay route 102 interface Serial1/3 202

no shut

!

interface Serial1/3

description FR to HQ

no ip address

encapsulation frame-relay IETF

clock rate 128000

no dce-terminal-timing-enable

frame-relay lmi-type ansi

frame-relay intf-type dce

frame-relay route 201 interface Serial1/1 101

frame-relay route 202 interface Serial1/2 102

no shut

-----------

note: you will have to modify the interfaces to fit your router.


-brad

www.ccbootcamp.com

(please rate the post if this helps!)


Correct Answer by ccbootcamp about 9 years 3 months ago

Yes, you can definitely use that for a frame switch. We use a 2811 as our frame switch and the PSTN cloud. But if you want to save some $$ a Cisco 2521 or 2520 has four serial ports and will do just fine.


-brad

www.ccbootcamp.com

(please rate the post if this helps!)


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Correct Answer
ccbootcamp Mon, 12/17/2007 - 22:02
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Yes, you can definitely use that for a frame switch. We use a 2811 as our frame switch and the PSTN cloud. But if you want to save some $$ a Cisco 2521 or 2520 has four serial ports and will do just fine.


-brad

www.ccbootcamp.com

(please rate the post if this helps!)


SteveDexter Mon, 12/17/2007 - 22:09
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That is good news. I saw one for $25. Do you have a configuration I can use?

Correct Answer
ccbootcamp Mon, 12/17/2007 - 22:17
User Badges:
  • Gold, 750 points or more

Here ya go:


---------------

frame-relay switching


interface Serial1/1

description FR to BR1

no ip address

encapsulation frame-relay IETF

no fair-queue

clock rate 128000

no dce-terminal-timing-enable

frame-relay lmi-type ansi

frame-relay intf-type dce

frame-relay route 101 interface Serial1/3 201

no shut

!

interface Serial1/2

description FR to BR2

no ip address

encapsulation frame-relay IETF

clock rate 128000

no dce-terminal-timing-enable

frame-relay lmi-type ansi

frame-relay intf-type dce

frame-relay route 102 interface Serial1/3 202

no shut

!

interface Serial1/3

description FR to HQ

no ip address

encapsulation frame-relay IETF

clock rate 128000

no dce-terminal-timing-enable

frame-relay lmi-type ansi

frame-relay intf-type dce

frame-relay route 201 interface Serial1/1 101

frame-relay route 202 interface Serial1/2 102

no shut

-----------

note: you will have to modify the interfaces to fit your router.


-brad

www.ccbootcamp.com

(please rate the post if this helps!)


SteveDexter Mon, 12/17/2007 - 22:21
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I noticed the clock rate above is set at 128000. Will that cause a problem with my lab and passing voice traffic? Can I set my clock rate higher?

Correct Answer
ccbootcamp Mon, 12/17/2007 - 22:25
User Badges:
  • Gold, 750 points or more

On some serial interfaces, yes, you can set the clock rate higher. On the NM-4A/S which we use, no, 128kbps is the highest clock rate it will take. Same thing with 2 of the 4 ports on the 2521 you are looking at purchasing (it has 2 low speed serial ports and 2 high speed serial ports).


-brad

www.ccbootcamp.com

(please rate the post if this helps!)


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