Understanding IPv4 Route Distribution in a Layer 3 VPN
Within a VPN, the distribution of VPN-IPv4 routes occurs between the PE and CE routers
and between the PE routers (see Figure 49 on page 822).
Figure 49: Route Distribution Within a VPN
This section discusses the following topics:
•
Distribution of Routes from CE to PE Routers on page 822
•
Distribution of Routes Between PE Routers on page 823
•
Distribution of Routes from PE to CE Routers on page 825
Distribution of Routes from CE to PE Routers
A CE router announces its routes to the directly connected PE router. The announced
routes are in IPv4 format. The PE router places the routes into the VRF table for the VPN.
In the Junos OS, this is the routing-instance-name.inet.0 routing table, where
routing-instance-name is the configured name of the VPN.
The connection between the CE and PE routers can be a remote connection (a WAN
connection) or a direct connection (such as a Frame Relay or Ethernet connection).
CE routers can communicate with PE routers using one of the following:
•
OSPF
•
RIP
Copyright © 2017, Juniper Networks, Inc.822
ACX Series Universal Access Router Configuration Guide
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