How Service Provider infrastructure looks???

[Ganesan Palaniappan]

Hi All.

I am just curious to understand about the Service Provider infrastructure and their backend connectivities with other service provider.

is there any private and public network ...will each service will have their own private network and provide end to end connectivity between two location...say 

india and us locations...or they will route traffic to different service provider also.

---- > what is meant by PPP --- is it leased dedicated cable runs from end to end ?.. then why we need L3 protocols over there....

----> Frame relay ---is this always referred as Private network..can't i have a internet connections with Frame relay running in my router ?

----> MPLS ---  can we have MPLS connections for internet or is it only for VPN / intranet / extranet connectivity ?

----> Finally, i have a isdn line with me .. and i read it is a SVC --- it creates a connection to the telephone office ..if i type www.cisco.com..how it is going to cisco.com  ????

Regards,

Gan

[petenixon]

The three technologies you describe (PPP, frame relay, MPLS) just describe layer 2 encapsulation protocols, except MPLS VPN which would be described at layer 3 of the OSI model, and you can use them all for internet access.

When you type www.cisco.com, the name is resolved into an IP address thanks to DNS.

Here are some really cool links to help you further your understanding:

PPP
http://www.cisco.com/c/en/us/tech/wan/point-to-point-protocol-ppp/index.html

Frame Relay
http://www.cisco.com/c/en/us/support/docs/wan/frame-relay/16563-12.html

MPLS
http://www.cisco.com/c/en/us/products/ios-nx-os-software/multiprotocol-label-switching-mpls/index.html

DNS
http://www.cisco.com/c/en/us/support/docs/ip/domain-name-system-dns/12683-dns-descript.html

ISP connectivity (this is by no means authoritative or complete)
http://en.wikipedia.org/wiki/Internet_backbone
 

Hope this helps.

[Ganesan Palaniappan]

Hi,

Can you please refer the attached diagram and provide  me simple text.. i just want to understand the L2 WAN protocols use and how service provider using that.... why can't service provide ethernet as their backbone... i referred a lot of pdf and docs.... missing to understand the difference..

Regards,

Gan

[Zain Khan]

HI,

SP infrastructure are very big network wich always have so many routers probably 100+ or more routers over IP/MPLS BGP protocols are running the high level design of network us very complex and very difficult to understand. the configuration can be done easily once you have a network high level design because the commands are almost same usually which you even use in your GNS labs as well

below there is one example of SP infrastructure which using IP/MPLS and BG protocols taken form CCIE LAB exam by cisco