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8-4 Riverstone Networks RS Switch Router User Guide Release 8.0
Configuring ATM Ports ATM Configuration Guide
The ATM OC-12 line card has a preset bit allocation scheme for the VPI/VCI pair which cannot be changed: 4 bits set
for VPI and 12 bits set for VCI. The ATM multi-rate line card has a default bit allocation of 1 bit allocated for the VPI
and 11 bits allocated for the VCI. This default bit allocation scheme provides a VPI range=(0,1) and # of virtual
channels=2
n
=2
11
=2048. If you require more VPIs, you will need to set your VPI bits to some number higher than 1.
But because there are only 12 bits available for VPI/VCI pairs on an ATM port, the more bits you allocate for VPI, the
fewer bits remain for VCI.
The bit allocation command allows you to set the number of bits allocated for the VPI on the ATM multi-rate line card;
the remaining number of bits are allocated for VCI. In the following example, the VPI bit allocation for port at.5.1 is
set to 2:
8.1.3 Displaying Port Information
You can display the parameters set for an ATM port. The following is an example of the information that is displayed
with the
atm show port-settings
command for a PDH PHY interface:
The following is an example of the information that is displayed with the
atm show port-settings
command for
a SONET PHY interface:
rs(config)# atm set port at.5.1 vpi-bits 2
rs(atm-show)# port-settings at.9.1
Port information for Slot 9, Port 1:
Port Type: T3 ATM coaxial cable
Xmt Clock Source: Local
Scramble Mode: Payload
Line Coding: B3ZS
Cell Mapping: Direct
Framing Cbit-Parity
VC Mode: 1 bit of VPI, 11 bits of VCI
Service Definition: user-default-OC3
Service Class: UBR
Peak Bit Rate: Best Effort
Sustained Bit Rate: 0 Kbits/sec (0 cps)
Maximum Burst Size: 0 cells
Encapsulation Type: VC-MUX
F5-OAM: Requests & Responses
rs(atm-show)# atm show port-settings at.7.1
Port information for at.7.1:
Port Type: SONET STS-3c MMF
Media Type: SONET
Xmt Clock Source: Local
VC Mode: 1 bit of VPI, 11 bits of VCI
Reservable Bandwidth: 309057 CPS, 131040168 bits/sec
OAM Timers: Detect Up: 15, Down: 15
Service Definition: default-OC3
Service Class: UBR
Peak Bit Rate: Best Effort
Encapsulation Type: LLC Multiplexing
Traffic Type: RFC-1483, multi-protocol
F5-OAM: Responses Only