Service provider devices that connect access links to customers are physically located in groups that are called points of presence (POPs). In general, the POP is a group of routers where access links are terminated. The edge routers that peer with other service providers can in this sense be considered a POP.
Service providers use different types of access links with different types of customers and usually mix access links in the same POP. Some customers use leased lines, others use xDSL, and still others use dial-in access or any other access that the provider can support.
POP routers connect to the network core using a layer of concentration routers at the POP. The network core forwards packets between POPs, various customer access points, or peering points with other service providers. Optimal routing between POPs is a desirable feature.
Configuring BGP on Cisco Routers (BGP) v3.2
Common Service Provider Network (Cont.)
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