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标签为 ‘QOS’的文章

ASR9k Netflow and QOS order in the inbound direction

My customer match a issue that business traffics take IP6,7 flag, then the traffics auto mapping to EXP6,7 that cause control police congestion, and ISIS flapping due to BFD flap. So they want to check which traffics have incorrect flag by netflow, so need to check ording for netflow and QOS at input direction. I check some documents, nobody notice that, so the article will show test info, you can check if you need. Finaly test result: At ingress direction, packets will be cached first by netflow, then do other action in QOS.

Btw, due to auto mapping from TOS to EXP by range, e.g: TOS 192-223 will map to EXP6; TOS 223-255 will map to EXP7. So if we want to check the issue by netflow, suggest filter EXP data, as in my follow test, check by follow command:

RP/0/RSP1/CPU0:ASR9006-G#sh flow monitor test-mpls cache brief location 0/0/cpu0 | i 7-0
Fri Jan  8 04:57:39.604 UTC
      LDP 44.44.44.44/32        30000-7-0        40034-7-1           -                -                -                -          Te0/0/0/2       Te0/0/0/1       Fwd                  3888         36           Egr 12.1.1.1         55.55.55.55      0xff     icmp     0          2048

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Mix for Fair-Queue and WRED on ASR1k’s class-default

最近接触了一个QOS的问题,借这个机会仔细研究了下对于Fair-Queue和WRED同时active时,QOS到底是如何working的。

当我们看到下面信息,能得出什么?OK, 咱们先不管是不是有burst,咱们先看看这些信息都代表什么。从qfp static drop中可以看到大部分都是TailDrop,那么这个TailDrop是谁执行的?那WRED又是在什么时候丢的包?数据包到底在default 队列遇到了什么导致了丢包?
Packets come in —> Per-flow queue —> WRED ?
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QOS之CBWFQ与LLQ简要说明

[关于QOS的东西,一直想总结下,但QOS东西很多,也不好整理,最近同事问到一个问题,正好复习了下,索性记录下来,已做日后参考。下面的测试是比较基础的,不涉及GSR,CRS,9k以及交换机的硬件QOS,很多中高端设备的QOS是由硬件做的,根据平台的不同,也不尽相同,本篇文档不做介绍。]

Topology:

PC(10.1.11.1.1)–(10.11.1.2)router1(f1/0)–(f1/0)router2(lo1,lo2,lo3)
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TS for 6748 output drop

When you found have output queue drop for CEF720 LC, you can check follow step:
1. which port have issue, whether at same ASIC.
2. check whether have other error or have qos on issue port.
3. whether hw queue is full.

Follow is TS example:

Problem description:

Output queue have drop
1. After checked by follow command:
– show tech
– show inter switching x/x
– show int x/x counter de
– show inter x/x summary
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3560 output drop affect voice vibrate

Refer to 3560 output drop increase issue.
All voice in one vlan 36.
And have some data vlan.

Follow are topology(summary):
——————————-

 +-----------+            +-----------+
 |   6509    |            |   6509    |
 +-----\-----+            +-----/-----+
        \                     //
         \                   /
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