Bxm Front Card Indicators; Table - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Chapter 5 BXM Card Sets: T3/E3, 155, and 622
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The Enhanced BXM cards include features that can be enabled by future firmware and switch software:
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BXM Front Card Indicators

The BXM front panel has a three-section, multicolored "card" LED to indicate the card status. The card
status LED is color-coded as indicated in Table 5-5. A three-section multi-colored "port" LED indicates
the status of the ports.
A two-port BXM-622 is shown in Figure 5-2. An 8-port BXM-155 front card is shown in Figure 5-3.
A 12-port BXM-T3/E3 is shown in Figure 5-4.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
On regular BXM cards, the VI traffic shaping rate is limited to OC-12/n, where n is an integer. On
the Enhanced BXM cards, the VI traffic shaping rate can be any desired shaping rate with a
precision of 9-bit mantissa and 4-bit exponent.
Provide ABR support for connections with non-AAL5 traffic
On the current BXM cards, the ABR support is limited to connections with AAL5 traffic. These
connections allow early packet discard to be applied to avoid queue congestion and thus maintain
RM cell flow. The Enhanced BXM cards extend the ABR support to connections with non-AAL5
traffic also. The Enhanced BXM cards minimize the problem of RM cell discard when RM cells
are injected into a congested VC by reserving room for 8 RM cells even when the VC begins to
drop data cells. The RM cell reserve can be globally configured for VSVD and non-VSVD
connections.
Support unidirectional ForeSight connections
On the current BXM cards, the ForeSight ABR (Cisco's pre-standard ABR implementation) support
is limited to bi-directional connections only. The current BXM cards also support ATM Forum
standard ABR for both bi-directional and unidirectional connections. The Enhanced BXM cards
will extend the ForeSight ABR support to include unidirectional connections also.
Support interworking of the port ABR segment controlled with ATM Forum ABR algorithm and
the network ABR segment controlled with ForeSight ABR algorithm.
The Enhanced BXM cards will provide coupling between the port ABR segment with ATM Forum
ABR algorithm and the network ABR segment with ForeSight ABR algorithm.
Separate frame discard CLP0 and frame discard CLP1 thresholds for each Class-of-Service (CoS)
queue
The Enhanced BXM cards support separate frame discard CLP0 and frame discard CLP1 thresholds
for each CoS queue. This feature enables preferential treatment for conforming traffic within CIR
(frames with CLP=1 start-of-frame cell) compared to non-conforming traffic (frames with CLP=0
start-of-frame cell) when applying early packet discard (EPD).
Merging of multiple frame-based VCs onto a single frame-based VC with future software upgrade
The Enhanced BXM card hardware will support VC merge to facilitate label switching with simple
software upgrade. With VC merge, the Enhanced BXM cards allow the BPX to aggregate multiple
incoming frame based VCs with the same destination address into a single outgoing frame-based
VC. Cells from different VCIs going to the same destination are transmitted to the same outgoing
VC using multipoint-to-point connections.
Where VC merge occurs, several incoming labels indicated by VCIs are mapped to one single
outgoing label. This sharing of labels reduces the total number of virtual circuits required for label
switching. Without VC merge, each source-destination prefix pair consumes one label VC on each
interface along the path. VC merge reduces the label space shortage by sharing labels for different
flows with the same destination.
Cisco BPX 8600 Series Installation and Configuration
BXM Front Card Indicators
5-9