Basic Networking
The S7700 uses the Multi-protocol Extensions for Border Gateway Protocol (MP-BGP) to
achieve the VPN route exchange between PEs. The static route, Routing Information Protocol
(RIP) multi-instance, Open Shortest Path First (OSPF) multi-instance, Intermediate System-to-
Intermediate System (IS-IS) multi-instance, or external BGP (EBGP) can be used to exchange
routes between a PE and a CE. In addition, by using VPN targets to control the transmission of
VPN routes, the S7700 can implement multiple VPN networking topologies including Intranet,
Extranet, and Hub&Spoke.
Typical Networking
The S7700 supports the following typical VPN networking:
l Inter-AS VPN
If a VPN backbone network spans multiple ASs, the inter-AS VPN must be configured.
Currently, the S7700 supports inter-AS VPN Option A and Option B.
l HoVPN
To relieve the stress on a PE, the Hierarchy of VPN (HoVPN) can be configured. A device
on the convergence layer or the access layer is selected as the Underlayer Provider Edge
(UPE), which works jointly with the PE, that is, the Superstratum Provider Edge (SPE) on
the backbone layer, to implement the functions of the PE.
l OSPF sham link
If OSPF runs between the PE and CE, an OSPF sham link can be configured to solve the
following problem: OSPF does not select the private route passing through the MPLS
backbone network, because the intra-area route passing through the backdoor link takes
precedence over the private route, as shown in Figure 3-2.
Figure 3-2 Schematic diagram of sham link
CE22
PE1
PE2
Area 1
OSPF 200
Area 1
OSPF 200
CE12
backdoor
sham link
VPN1
site3
VPN1
site1
MPLS VPN backbone
l Multi-VPN-Instance CE
The Multi-VPN-Instance CE can be configured to improve the routing capability of the
LAN, solve the security problem of the LAN at a low cast, and ensure that the LAN services
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
98
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