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交换机丢包

二层转发

2020-07-20提问

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你他娘真是个天才

你他娘真是个天才二段

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问题描述：

客户反映交换机丢包怎么测试

最佳答案

zhiliao_13zc

zhiliao_13zc 七段

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流统确认下丢包位置，如果确认是交换机侧丢包，收集对应设备的诊断信息和流统信息，返回400分析处理

acl number 3333
description traffic accounting for host A to host B
rule 10 permit tcp source 1.1.1.1 0 destination 2.2.2.2 0 destination-port eq www
acl number 3334
description traffic accounting for host B to host A
rule 10 permit tcp source 2.2.2.2 0 source-port eq www destination 1.1.1.1 0
#
traffic classifier traffic_accounting_from_A_to_B operator and
if-match acl 3333
traffic classifier traffic_accounting_from_B_to_A operator and
if-match acl 3334
#
traffic behavior traffic_accounting_from_A_to_B
accounting packet
traffic behavior traffic_accounting_from_B_to_A
accounting packet
#
qos policy traffic_accounting_from_A_to_B
classifier traffic_accounting_from_A_to_B behavior traffic_accounting_from_A_to_B
qos policy traffic_accounting_from_B_to_A
classifier traffic_accounting_from_B_to_A behavior traffic_accounting_from_B_to_A
#
interface GigabitEthernet2/0/1
qos apply policy traffic_accounting_from_A_to_B inbound
qos apply policy traffic_accounting_from_B_to_A outbound
#
interface GigabitEthernet2/0/2
qos apply policy traffic_accounting_from_B_to_A inbound
qos apply policy traffic_accounting_from_A_to_B outbound

注意事项

1、对匹配的流量计一定要尽量精确，避免其他流量影响统计结果。

2、注意流量双向性和qos策略下发的方向要正确下发。

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苦逼网工

苦逼网工六段

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判断是否丢包，最好的方法就是流统。参考http://kms2.h3c.com/View.aspx?id=41506

定义acl，匹配PCA访问PCB的流量计，在做流量统计时应尽量保证匹配的情况精确，避免抓取到其他业务流量，使流量统计不准确。

[H3C]acl number 3333

[H3C-acl-adv-3333]description traffic accounting for host A to host B

[H3C-acl-adv-3333]rule 10 permit tcp source 1.1.1.1 0.0.0.0 destination 2.2.2.2 0.0.0.0 destination-port eq 80

定义流分类，匹配acl定义的PCA访问PCB的web流量。

[H3C]traffic classifier traffic_accounting_from_A_to_B

[H3C-classifier-traffic_accounting_from_A_to_B]if-match acl 3333

定义流行为，统计报文个数

[H3C]traffic behavior traffic_accounting_from_A_to_B

[H3C-behavior-traffic_accounting_from_A_to_B]accounting packet

定义qos策略，关联流分类和流行为

[H3C]qos policy traffic_accounting_from_A_to_B

[H3C-qospolicy-traffic_accounting_from_A_to_B]classifier traffic_accounting_from_A_to_B behavior traffic_accounting_from_A_to_B

在2/0/1的入方向和2/0/2的出访问下发qos策略，来统计报文是否到达设备和是否被设备转发给PCB。

[H3C]interface GigabitEthernet2/0/1

[H3C-GigabitEthernet2/0/1]qos apply policy traffic_accounting_from_A_to_B inbound

[H3C]interface GigabitEthernet2/0/2

[H3C-GigabitEthernet2/0/2]qos apply policy traffic_accounting_from_A_to_B outbound

使PCA访问PCB，查看接口GigabitEthernet2/0/1流量统计结果

[H3C]display qos policy interface GigabitEthernet 2/0/1

Interface: GigabitEthernet2/0/1

Direction: Inbound

Policy: traffic_accounting_from_A_to_B
Classifier: traffic_accounting_from_A_to_B
Operator: AND
Rule(s) : If-match acl 3333
Behavior: traffic_accounting_from_A_to_B
Accounting Enable:
5 (Packets)