Beta Draft Confidential
21-16
1/19/05
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring PNNI Routing
PNNI Signaling Overview
Lucent ATM Node Prefix
Each CBX 3500, CBX 500, or GX 550 switch can automatically advertise a unique
13-byte ATM node prefix, in which is embedded the switch’s 4-byte internal IP
address. You can identify the SPVC node prefix address in the following way: the
address is formed by concatenating the Local authority and format identifier (AFI)
value (0x49), the Lucent Organizationally Unique Identifier (OUI) (0x00C07B), and
x02. The switch’s internal IP address is then inserted in the last 4 bytes (hexadecimal
format).
For example, a switch that has an internal IP address of 153.167.1.5 advertises the
following SPVC node prefix:
0x4900C07B020000000099A70105
Both the VNN OSPF and PNNI routing protocols on the switch advertise the SPVC
node prefix. Therefore, if the path for an ATM PVC cannot be determined using the
traditional VNN routing mechanism, the calling node instead will automatically
attempt to establish a path to the destination node’s SPVC prefix. This function allows
the use of both PNNI paths and hybrid PNNI/VNN paths to establish the ATM PVC.
When an ATM PVC is routed using the destination node’s SPVC node prefix as the
destination address, a 20-byte ATM address is constructed, using the SPVC node
prefix as the first 13 bytes; the destination LPort is inserted in the last two bytes. If the
call traverses the PNNI domain, the destination VPI/VCI is inserted in both the
Broadband Higher Level Information (BHLI) information element (IE) and the called
party SPVC IE.
Because this routing mechanism is performed automatically, it allows the
establishment of ATM PVCs over PNNI domains or over a combination of
PNNI/VNN domains, without requiring any reconfiguration of ATM PVCs.
Summary of Contents for CBX 3500
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