Beta Draft Confidential
13-101/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring Layer 2 VPNs
Layer 2 VPNs Over PNNI
Layer 2 VPNs Over PNNI
Layer 2 VPNs over PNNI are supported on CBX 500 and GX 550 switches. Supported
circuits include PVCs, SVCs, and SPVCs.
The entire PNNI configuration needs to be done on the switches that form part of the
PNNI domain. The NNI ports can be configured at egress and ingress cards of the
connecting switches by selecting PNNI as the protocol.
By default, all PNNI links are part of the public VPN. When a PNNI link is assigned
to a VPN other than public, it is no longer available to any other VPN. The endpoints
of a PNNI link must be configured to the same VPN.
After VPN IDs have been created, PNNI interfaces and circuits can be assigned to the
VPN. Both VNN and PNNI links can be assigned to a particular VPN. Layer 2 VPNs
over PNNI are supported within peer groups and on border trunks and will function in
a multi-level PNNI domain.
If there are multiple border nodes, PNNI routing will give preference to the border
node that belongs to a particular VPN, unless no other VPNs exist. In that case, the
border nodes in the public VPN will be selected. Similarly, if there are multiple paths
that can be used within a peer group, preference will be given to the links that belong
to a particular VPN.
To configure a Layer 2 VPN over PNNI:
1. Create a Layer 2 VPN (see “Configuring a Layer 2 VPN” on page 13-4).
2. Add customers to the Layer 2 VPN (see “Adding Customers to the Layer 2 VPN”
on page 13-5).
3. Assign the PNNI Lports to the VPN (see “Configuring a Logical Port for Layer 2
VPN” on page 13-7).
Layer 2 Limitations on PNNI Links
In a network consisting of multiple domains such as PNNI-VNN-PNNI or
VNN-PNNI-VNN, a VPN path to a destination beyond a particular gateway can not be
defined. Also, usage of VPN trunks beyond the first domain is not ensured.
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