| Using the enhanced PXM-1E or one of the PXM45 variants, the 8850 and 8950 switches all support PNNI. MGX 8850 and 8950 switches support the following PNNI features in the latest maintenance release of software version 2.1: UNI 3.0/3.1/4.0 PNNI 1.0 with hierarchy and multiple peer group ILMI 4.0 ATM Inter-Network Interface (AINI) Standard IISP with PNNI interworking Enhanced IISP for SPVC support Point-to-point ATM SVCC and SVPC Support for ABR, CBR, VBR, VBR-RT, VBR-NRT, and UBR Alternate call routing On-demand call routing Native E.164 and AESA (E.164, ICD, DCC) addressing Per-class of service, per-connection overbooking Address filtering
The BPX supports PNNI with the addition of the SES. PNNI feature support in the latest maintenance release of SES software version 1.1 is identical to the MGX 2.1 features just listed. NOTE Unlike the MGX, the SES does not support NCDP for clock synchronization. AR serves this purpose. Additional MGX and SES PNNI features supported in software release 3.0 include the following: Priority connection routing High-priority connections establish and release before low-priority connections, improving high-priority reroute times. Preferred connection routing This lets the administrator override PNNI path selection for a connection and manually configure the connection's route through the network. Per-connection overbooking This lets the administrator configure the percent utilization per connection, providing more granularity than configuration percent utilization per interface.
Current MGX release 2.1 MSS PNNI limitations include the following: Ten levels of hierarchy 192 interfaces per node. Up to 100 of those are configured for IISP, PNNI, or UNI signaling because of SSCOP support on 100 interfaces. A 255-node limit per peer group. Any single node may have visibility to 254 other peer nodes. For LGNs, 255 includes the peer nodes in its group plus the nodes in its child peer group. 3000 AESAs per node 3200 PNNI links visible to any single node 100,000 total SVCs and/or SPVCs per node
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