Cisco Cisco 12000 Series 4-Port OC-12c STM-4c ATM Line Card 故障排查指南
Contents
Introduction
Prerequisites
Requirements
Components Used
Problem
Troubleshoot & Verify
Solution
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Introduction
EtherChannel bundle is used to provide high bandwidth interconnects. This article discusses a
limitation which applies to Cisco EtherChannels on Catalyst 6500 switches running Supervisor 720
with PFC3A, PFC3B or PFC3BXL that can cause overrun to increment on Etherchannel member
interfaces. This limitation is related to Layer 2 Forwarding Engine and hence applies only to layer
2 EtherChannels.
limitation which applies to Cisco EtherChannels on Catalyst 6500 switches running Supervisor 720
with PFC3A, PFC3B or PFC3BXL that can cause overrun to increment on Etherchannel member
interfaces. This limitation is related to Layer 2 Forwarding Engine and hence applies only to layer
2 EtherChannels.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on Cisco Catalyst 6500 Series switches that run
Supervisor Engine 720. WS-X6704-10GE has been used in this lab setup.WS-X6704-10GE is a
Catalyst 6500 module with no oversubscription & has 2 fabric channel connections of 20 Gbps
each.
Supervisor Engine 720. WS-X6704-10GE has been used in this lab setup.WS-X6704-10GE is a
Catalyst 6500 module with no oversubscription & has 2 fabric channel connections of 20 Gbps
each.
The information in this document was created from the devices in a specific lab environment. All of
the devices used in this document started with a cleared (default) configuration. If your network is
live, make sure that you understand the potential impact of any command.
the devices used in this document started with a cleared (default) configuration. If your network is
live, make sure that you understand the potential impact of any command.
Problem
A Catalyst 6500 might experience interface overrun when a Layer 2 Distributed Etherchannel
(DEC) is configured. DEC is an etherchannel An Etherchannel with 2 member interfaces
connected on the same linecard but on different fabric channels is not considered a DEC.
(DEC) is configured. DEC is an etherchannel An Etherchannel with 2 member interfaces
connected on the same linecard but on different fabric channels is not considered a DEC.
Overrun counter accounts number of times the receiver hardware was unable to hand received
data to a hardware buffer. In other words, the input rate of traffic exceeded the ability of the
receiver to handle the data.
data to a hardware buffer. In other words, the input rate of traffic exceeded the ability of the
receiver to handle the data.