ATM Connection Configuration
Figure 21-9 Meaning of VSVD and Flow Control External Segments
5
2
1
2
3
4
5
Available Bit Rate Foresight Connections
The Available Bit Rate Foresight (ABRFST) connection uses the propriety ForeSight congestion
control and is useful when configuring connections on which both ends do not terminate on BXM cards.
The parameters for an ABRFST connection are shown in Figure 21-10 in the sequence in which they
occur during the execution of the addcon command.
Cisco BPX 8600 Series Installation and Configuration
21-34
ABR Standard
VSVD
No
Yes
Flow control
external
No
segment
Yes
4
VS and VD shown below are for traffic flowing
in direction of arrow. For the other direction of traffic,
VS and VD are in the opposite direction.
External segment
Network segment
ABR with ForeSight
VS
ABR standard
VS
ABR VD
ABR with ForeSight
VS
ABR VD
VS
ABR standard
ABR standard without VSVD
(without congestion flow control performed by network segment)
ABR with ForeSight
Flow control
1
external
No
segment
Yes
3
External segment
VD
VS
ABR VD
VD
VS
ABR VD
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 21
Configuring ATM Connections