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routing topology to ISP

Posted on 2010-08-31
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I am just curious what the typical topology of routing out to the ISP is and an example of the equipment used.   See the following diagram:

http://ptgmedia.pearsoncmg.com/images/chap01_158705146x/elementLinks/fig16.jpg

It shows multiple routes summarized to the E router.  So let's say I have Comcast.  They provide me a modem/router.  What equipment might this connect to?  Multiple routers with 100's of Comcast customers in the area?  If so, do they make Cisco routers that provide dozens of interfaces just for this application (ISP's)?  

So to summarize, I basically want to find out how 100's of customers are consolidated into the ISP and the equipment used.
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Question by:B1izzard
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rfc1180 earned 500 total points
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>It shows multiple routes summarized to the E router.  So let's say I have Comcast.  
They provide me a modem/router.  What equipment might this connect to?

Typically they will give you a bridge with a built in firewall; the bridge converts the Ethernet technology to a coax network. Typically the network would extend to a cable modem termination system and then from their to a core network. A typical CMTS device would be a uBR7200VXR Platform; possible configurations would be the use of 802.1Q Transparent LAN Service (TLS) feature and  DOCSIS deployments to provide L2VPN services. There are many types of topologies that can be used:

http://en.wikipedia.org/wiki/Cable_modem_termination_system
http://www.ciscosystems.com.pe/en/US/tech/tk86/tk804/technologies_tech_note09186a0080204a1a.shtml
http://www.ciscosystems.com.pe/en/US/tech/tk86/tk804
/technologies_tech_note09186a00800a9702.shtml
http://cablelabs.net/specifications/SP_CMTS_NSII01-960702.pdf

Billy
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by:B1izzard
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Great info.  Thanks!
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