Route Distinguisher (Rd) Conventions; Route Target (Rt) Conventions; Configuration Steps - Avaya 8600 Technical Configuration Manual

2.1.4 Route Distinguisher (RD) Conventions

The RD is pre-pended to the VRF IP routes to make a VPNv4 address which is then re-advertised by
BGP. One purpose of the RD is thus to make those VPNv4 addresses unique to BGP. Hence the RD
must be configured to a unique value for every VRF in the network.
Another purpose of the RD, exclusively with IPVPN-Lite, is to carry the IP address to be used as
destination IP when IPinIP encapsulating IPVPN traffic routed towards those VPNv4 routes.
Thus, for IPVPN-Lite, the format of RD is always the following : <IP-address>:<number>
Where <number> can be any value between 0 and 65535 and <IP-address> must always be a valid IP
address within the Network address of CLIP#2 (or CLIP#3)
The following convention will be used for RD pointing at CLIP#2: 172.16.s.y:y
Where:
o
s = Switch number
o
y = VRF-id
The following convention will be used for RD pointing at CLIP#3: 172.16.0.x:y
Where:
x = 256 – VRF-id
o
o
y = VRF-id

2.1.5 Route Target (RT) Conventions

The RT is the glue that allows a VPNv4 route exported by one VRF to be accepted and installed in
another VRF. Export RTs are encoded in BGP Update messages together with the VPNv4 routes they
refer to. Import RTs are used to decide whether to accept and install a VPNv4 route received from a BGP
neighbor.
The format of RT we will be using is : <AS-number>:<number>
Where <number> can be any value between 0 and 4294967295.
The AS number used in this example is 65000. So the following convention will be used for RT:
65000:6yyyp
Where:
o
6 = Non zero digit 6 so that following VPN-id (yyy) is left justified with zeros
o
yyy = VPN-id
o
p = Spoke (1) or (0) otherwise

2.2 Configuration Steps

The configuration steps required are as follows:
1. Base Configuration

Enabling R-mode

Configuring switch names

Configuring edge & firewall interfaces
Network Design Implementation to Provide L2 & L3 VPN Connectivity
November 2010
between Sites using SMLT and IPVPN-Lite for ERS 8600
Technical Configuration Guide
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