Coverage and Topology


Preference should be given to providers that can offer provider edge (PE) devices in the majority of the vicinities where you have site locations. The reason for this is that latency over the high-speed networks that connect PE devices is much lower than the latency of lower-speed links connecting enterprise edge routers to the PE. The more PEs in the vicinity of your site locations, the less backhaul over low-speed networks that is required.

When considering extranet capability, it is likely that the sites on your network that you want to be visible to a partner remain limited in scope, meaning that the partner is not simply made part of the any-to-any VPN. Therefore, you should determine if the provider can support one of these scenarios for extranet connectivity:

  • A Layer 2 VPN service between your enterprise and an extranet partner site, terminating in a separate data-link connection identifier (DLCI), virtual circuit (VC), or VLAN for each partner site.

  • A separate virtual routing/forwarding instance (VRF) per extranet partner site, delivered via a separate DLCI, VC, or VLAN to the CE router.

These issues could be addressed by questions such as the following:

  • PE coverage Please provide the global locations (cities) where you locate your PE routers, owned and operated by you, for customer connections.

  • Partners' PE coverage and interconnects If you leverage partners to provide local access, please give the global locations (cities) where your partners provide PE routers. Please provide the global locations (cities) where you interconnect with the partners' networks. Please also provide details on the Cisco Powered Network (CPN) designations and use of Cisco equipment in each partner's network.

  • Extranet connectivity Can you offer an Layer 2 VPN service between a Cisco extranet partner site and Cisco, terminating in a separate DLCI, VC, or VLAN for each partner site at a Cisco location? Can you offer a separate Layer 3 VRF for each extranet partner site, terminating on the Cisco customer edge (CE) router in a separate DLCI, VC, or VLAN?




Selecting MPLS VPN Services
Selecting MPLS VPN Services
ISBN: 1587051915
EAN: 2147483647
Year: 2004
Pages: 136

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