Network-to-network interface: Difference between revisions
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In [[telecommunications]], a '''network-to-network interface''' ('''NNI''') is an interface that specifies signaling and management functions between two networks. An NNI circuit can be used for interconnection of signalling (e.g., [[Signalling System No. 7|SS7]]), [[Internet Protocol]] (IP) (e.g., [[Multiprotocol Label Switching|MPLS]]) or [[Asynchronous Transfer Mode|ATM]] networks. |
In [[telecommunications]], a '''network-to-network interface''' ('''NNI''') is an interface that specifies signaling and management functions between two networks. An NNI circuit can be used for interconnection of signalling (e.g., [[Signalling System No. 7|SS7]]), [[Internet Protocol]] (IP) (e.g., [[Multiprotocol Label Switching|MPLS]]) or [[Asynchronous Transfer Mode|ATM]] networks. |
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In networks based on [[MPLS]] or [[GMPLS]], NNI is used for the interconnection of core [[P Router|Provider Routers]] (class 4 or higher). |
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In the case of GMPLS, the type of interconnection can vary across Back-to-Back, [[EBGP]] or mixed NNI connection scenarios, depending on the type of [[Virtual Routing and Forwarding|VRF]] exchange used for interconnection. In case of Back-to-Back, VRF is necessary to create [[VLAN]]s and subsequently sub-interfaces (VLAN headers and DLCI headers for [[Ethernet]] and [[frame relay]] network packets) on each interface used for the NNI circuit. In the case of eBGP NNI interconnection, P routers are taught how to dynamically exchange VRF records without VLAN creation. |
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There could be different encapsulation types for NNI interconnection, but Ethernet (GigE) and frame relay are basically used. |
There could be different encapsulation types for NNI interconnection, but Ethernet (GigE) and frame relay are basically used. |
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Revision as of 14:28, 18 August 2014
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 | This article may be too technical for most readers to understand. (April 2010) |
In telecommunications, a network-to-network interface (NNI) is an interface that specifies signaling and management functions between two networks. An NNI circuit can be used for interconnection of signalling (e.g., SS7), Internet Protocol (IP) (e.g., MPLS) or ATM networks.
In networks based on MPLS or GMPLS, NNI is used for the interconnection of core Provider Routers (class 4 or higher). In the case of GMPLS, the type of interconnection can vary across Back-to-Back, EBGP or mixed NNI connection scenarios, depending on the type of VRF exchange used for interconnection. In case of Back-to-Back, VRF is necessary to create VLANs and subsequently sub-interfaces (VLAN headers and DLCI headers for Ethernet and frame relay network packets) on each interface used for the NNI circuit. In the case of eBGP NNI interconnection, P routers are taught how to dynamically exchange VRF records without VLAN creation. NNI also can be used for interconnection of two VoIP nodes. In cases of mixed or full-mesh scenarios, other NNI types are possible.
There could be different encapsulation types for NNI interconnection, but Ethernet (GigE) and frame relay are basically used.
See also
References
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