Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Questions

Hi

1)is DSL/T1/T3/E1/E3 are Layer 1? are the considered Leased Line?

Give a link that describe their Functionalitires

2)ususlay what is the link between CE and PE routers in order to run L3 MPLS VPN?

Thanks

6 REPLIES

Re: Questions

Hi,


1)is DSL/T1/T3/E1/E3 are Layer 1? are the considered Leased Line?


T1/T3/E1/E3 can be considered as lease line but DSL can be considered as broadband.


http://en.wikipedia.org/wiki/Digital_Subscriber_Line   -- DSL Link


E1 Link:

E1 carries signals at 2 Mbps (32 channels at 64Kbps, with 2 channels reserved for signaling and controlling), versus the T1, which carries signals at 1.544 Mbps (24 channels at 64Kbps). E1 and T1 lines may be interconnected for international use.


T1 Link:

A dedicated phone connection supporting data rates of 1.544Mbits per second. A T-1 line actually consists of 24 individual channels each of which supports 64Kbits per second. Each 64Kbit/second channel can be configured to carry voice or data traffic. Most telephone companies allow you to buy just some of these individual channels, known as fractional T-1 access.

T-1 lines are a popular leased line option for businesses connecting to the internet and for ISP connecting to the Internet backbone.The Internet backbone itself consists of faster T-3 connections.

T-1 lines are sometimes referred to as DS1 lines.


T3 Link:

A dedicated phone connection supporting data rates of about 43 Mbps. A T-3 line actually consists of 672 individual channels, each of which supports 64 Kbps.T-3 lines are used mainly by Internet Service Providers (ISPs) connecting to the Internet backbone and for the backbone itself.
T-3 lines are sometimes referred to as DS3 lines.


Usually in L3 MPLS VPN, Ethernet link will be used.Either it may be fiber link or ethernet link


regards

karuppu

New Member

Re: Questions

Hi karuppu

Thanks for ur good info, regarding this:

Usually in L3 MPLS VPN, Ethernet link will be used.Either it may be fiber link or ethernet link

do y have links that describe deployment scenario for MPLS VPN

Thanks

Re: Questions

Hi,

Something I have for ethernet.have a look of the below url

http://en.wikipedia.org/wiki/Metro_Ethernet

regards

karuppu

New Member

Re: Questions

Hi Freind

what about if the Link is Fiber?

Thanks

Re: Questions

Hi,

Usually if you are buying STM link(155Mbps) it will come with fiber link and used to call as POS Link(Power over Sonet).There will be seperate module to connect this link with either router or switch(cisco 6500 series)

for more about SONET/SDH Link , just go through the below link

http://en.wikipedia.org/wiki/Synchronous_optical_networking

Regards

Karuppu

Re: Questions

Sorry to chime in ..

Your L3 VPN will work over all the above Links.

Would recommend books like:-

MPLS Configuration on Cisco IOS by Lancy/Umesh

MPLS fundamentals

MPLS and VPN Architectures by Ivan Pepelnjak

You would get more than enough knowledge for deployment.

206
Views
15
Helpful
6
Replies