Administrator Guide

Monitoring HiGig Link Bundles
You can monitor the HiGig link bundles that transmit data between internal backplane ports on line-card (leaf) and switch fabric module
(SFM - spine) network processing units (NPUs) and generate a system log message or SNMP trap when traffic distribution in a link
bundle is uneven. Each NPU is a Trident chip.
On the switch, backplane port channels operate as HiGig link bundles to transmit data traffic between line-card and SFM NPUs. There are
11 line-card and 2 SFM NPUs. The two SFM (spine) NPUs include the switch fabric module.
Each line-card use one NPU numbered 0. SFM NPUs are numbered 0 to 1.
Line-card and SFM NPUs use HiGig link bundles to transmit data.
• An SFM (spine) NPU uses 10 HiGig link bundles, one link bundle to transmit data to each line-card (leaf) NPU. Each HiGig link bundle in
an SFM NPU consists of three HiGig links.
• A line-card (leaf) NPU supports 24 front-end I/O ports and 6 backplane HiGig ports. The six backplane links are members of 2 HiGig
link bundles that connect the line-card NPU to each SFM (spine) NPU. Three HiGig links in the bundle are used to connect to each
SFM NPU
You can enable the capability to detect uneven traffic distribution in the member links of a HiGig link bundle on a line-card or SFM NPU.
You can also enable a notification to be sent using alarms and SNMP traps. The algorithm used to determine uneven distribution of traffic
is predefined.
Monitoring HiGig link bundles allows you to view and analyze unequal traffic flow in backplane port channels and take corrective action.
Alarms are generated if the link-bundle traffic threshold is greater than the configured threshold and the unevenness is greater than 10
percent between links for three successive rate-intervals. Alarms are removed when the link-bundle threshold is lower than the configured
threshold and the unevenness is less than 10 percent between links for three successive rate intervals.
An alarm includes the following information:
• Line-card or SFM NPU unit and HiGig port-channel ID in the format: hg-port-channel slot slot/npu-id/hg-port—
channel-id
• Alarm: triggered or cleared
Examples of the system log messages triggered when the threshold for a HiGig link bundle/port channel is exceeded are:
• %STKUNIT0-M:CP %SWMGR-5-HG-BUNDLE_UNEVEN_DISTRIBUTION: Found uneven distribution in hg-port-channel
0/5/0
• %STKUNIT0-M:CP %SWMGR-5-HG-BUNDLE_UNEVEN_DISTRIBUTION_ALARM_CLEAR: Uneven distribution in hg-
port-channel 0/5/0 got cleared
Guidelines for Monitoring HiGig Link-Bundles
When configuring HiGig link-bundle monitoring on the backplane, follow these guidelines:
• By default, the capability to monitor the traffic distribution in a HiGig link bundle on a line-card or SFM NPU is disabled.
• Each line-card NPU uses two HiGig link bundle for its backplane links to connect each SFM (spine) NPU. The convention used to
identify a HiGig link-bundle interface is: hg-port-channel slot/npu-id/0, where slot specifies the line-card slot number (0–11), npu-id
specifies the NPU ID number (0), and HiGig port-channel ID which is in the range (0-2) for a line-card NPU
• Each SFM NPU uses a separate HiGig link bundle to connect to each line-card (leaf) NPU. The convention used to identify a HiGig
link-bundle interface is: hg-port-channel
slot /higig-port-channel-id, where slot specifies SFM slot number which is in the range of 0 to
1, npu-id specifies the NPU ID number (0)
• HiGig link-bundle monitoring starts only when:
• You enable monitoring for a specified HiGig link bundle using the hg-link-bundle monitor command.
• Bundle usage for egress traffic exceeds the threshold configured with the hg-link-bundle monitor trigger-
threshold command.
Alarms are generated only when link-bundle traffic levels are high. At low traffic levels, only one or two significant flows may cause
unevenness. However, uneven traffic distribution across links during low-traffic periods is not critical and does not trigger an alarm.
• You can enable SNMP traps and syslog messages to be generated when an uneven traffic distribution is detected in a HiGig link
bundle.
• Traffic distribution in a HiGig link bundle is calculated as the bandwidth-weighted mean use of all links in the bundle. This calculation is
performed only on links that are up in their operational status.
• The rate interval used to poll traffic distribution in member links in a HiGig link bundle is user-configurable. The default polling interval is
15 seconds.
418
Interfaces