Cisco bpx-8620 ユーザーガイド
21-12
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 21 Configuring ATM Connections
ATM Connection Flow
Note
For a description of traffic shaping on CBR, rt-VBR, nrt-VBR, and UBR connections,
refer to the section later in this chapter, Traffic Shaping for CBR, rt-VBR, nrt-VBR, and
UBR, page 21-13.
refer to the section later in this chapter, Traffic Shaping for CBR, rt-VBR, nrt-VBR, and
UBR, page 21-13.
Egress to Network via BXM 10
In this example, ATM cells destined for BPX 2 are applied via the BCC crosspoint switch and BPX
backplane to BXM 10 and out to the network. The cells are served out to the network via the appropriate
trunk qbin, CBR, rt-VBR, nrt-VBR, ABR, or UBR.
backplane to BXM 10 and out to the network. The cells are served out to the network via the appropriate
trunk qbin, CBR, rt-VBR, nrt-VBR, ABR, or UBR.
Ingress from Network via BXM 5
ATM cells from the network that are applied to BXM 5 in BPX 2 are processed at the physical level and
routed to one of 15 per card slot servers, each of which contains 16 CoS service queues, including ATM
service types CBR, rt-VBR, nrt-VBR, ABR, and UBR.
routed to one of 15 per card slot servers, each of which contains 16 CoS service queues, including ATM
service types CBR, rt-VBR, nrt-VBR, ABR, and UBR.
Cells are served out from the slot servers via the BPX backplane to the BCC crosspoint switch. The
cells are served out on a fair basis with priority based on class of service, time in queue, bandwidth
requirements, etc.
cells are served out on a fair basis with priority based on class of service, time in queue, bandwidth
requirements, etc.
Egress from BXM 11 to CPE 2
In this example, ATM cells destined for CPE 2 are applied via the BCC crosspoint switch and BPX
backplane to BXM 11 and out to CPE 2. The cells are served out to CPE 2 via the appropriate port qbin,
CBR, rt-VBR, nrt-VBR, or ABR/UBR.
backplane to BXM 11 and out to CPE 2. The cells are served out to CPE 2 via the appropriate port qbin,
CBR, rt-VBR, nrt-VBR, or ABR/UBR.
ATM cells undergoing traffic shaping, for example ABR cells are applied to traffic shaping queues
before going to one of the 15 per card slot servers. ATM cells applied to the traffic shaping queues
receive additional processing, including congestion control by means of VSVD or ForeSight and virtual
connection queuing.
before going to one of the 15 per card slot servers. ATM cells applied to the traffic shaping queues
receive additional processing, including congestion control by means of VSVD or ForeSight and virtual
connection queuing.