Related Documentation
- J Series
- CLNS Overview
- Example: Configuring BGP for CLNS VPNs
- SRX Series
- CLNS Overview
- Example: Configuring BGP for CLNS VPNs
- Additional Information
- Junos OS Feature Support Reference for SRX Series and J Series Devices
Understanding BGP for CLNS VPNs
BGP extensions allow BGP to carry Connectionless Network Service (CLNS) virtual private network (VPN) network layer reachability information (NLRI) between provider edge (PE) routers. Each CLNS route is encapsulated into a CLNS VPN NLRI and propagated between remote sites in a VPN.
CLNS is a Layer 3 protocol similar to IP version 4 (IPv4). CLNS uses network service access points (NSAPs) to address end systems. This allows for a seamless autonomous system (AS) based on International Organization for Standardization (ISO) NSAPs.
 | Note: CLNS is supported for the J Series Services Router only. |
A single routing domain consisting of ISO NSAP devices are considered to be CLNS islands. CLNS islands are connected together by VPNs.
You can configure BGP to exchange ISO CLNS routes between PE routers connecting various CLNS islands in a VPN using multiprotocol BGP extensions. These extensions are the ISO VPN NLRIs.
Each CLNS network island is treated as a separate VPN routing and forwarding instance (VRF) instance on the PE router.
You can configure CLNS on the global level, group level, and neighbor level.
Related Documentation
- J Series
- CLNS Overview
- Example: Configuring BGP for CLNS VPNs
- SRX Series
- CLNS Overview
- Example: Configuring BGP for CLNS VPNs
- Additional Information
- Junos OS Feature Support Reference for SRX Series and J Series Devices
