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标签为 ‘CEF’的文章

How to troubleshooting HW FIB on ASR9k | PBTS/TE

Problem Description

Follow Topology

 

 10.200.0.24               10.200.0.26    10.200.0.32
   +------+      +------+     +------+     +------+
   |XiAn  |      | SZ   |     |HKBR  |     |Canada|
   |Huawei+------+      +-----+ASR9k +-----+ASR9k |
   +------+      +------+     +------+     +------+

For the issue, HuaWei is Head, asr9k should mid and end node. And Huawei found they put the traffics to Canada by LDP label, not TE label. So traffics should arrive to HK ASR9k by LDP label, then forwarding by LDP too from HK ASR9k to Canada. That not match normal scenario.

For normal scenario, should use TE label from head to end. And after Huawei put traffics to TE LSP, the issue will recovery to normal. Refer to why Huawei send traffics by LDP, that should their issue, will fix in future by them, but even if to do that, 9k shouldn’t drop packets. We need find whether packets drop at 9k and due to label issue first. Now set up test environment in customer site. waiting update.

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Multi Hierarchical CEF / Load Share

环境

 --------+--------------------+---------
         |   22.22.22.22/32   |
         |                    |
    +----+----+          +----+----+
    | 2.2.2.2 |          | 3.3.3.3 |
    | RouterA |          | RouterB |
    +-\----\--+          +-/---/---+
       \    \             /   /
        \\   \           /   /
          \   \         /  //
           \   \F2/0   /  /
            \\  \     /  /
         F1/0 \  \ F3/0 / F4/0
               *--\-/--*
               |1.1.1.1|
               | CoreA |
               +-------+

不限设备,所有运行IOS的设备,包括GSR,7609等。
在早期版本,不支持Multi hierarchical CEF,仅仅支持一层递归后的转发。这样产生了很多限制,例如今天提到的双PE结构。在特定版本后(包括IOS和IOX),CEF的行为有了改变,并且支持多层CEF。不过CEF的行为也要看平台,因为GSR上任何版本都不支持这种多层CEF。
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7609 Load Balance Issue and Polarization

环境:

1. CISCO7609
2. Two engine for WS-SUP720-3BXL

问题:

客户配置了5条静态路由负载均衡,状态及流量都比较正常,但当客户加了第6条静态路由的时候,发现有一个口的流量与其他相比少了很多。

30 second input  rate 349662000 bits/sec, 141978 packets/sec |
30 second output rate 330499000 bits/sec, 71334 packets/sec  |(9/1)
-------------------------------------------------------------|----
30 second input  rate 363785000 bits/sec, 139117 packets/sec |
30 second output rate 634835000 bits/sec, 134002 packets/sec |(9/9)
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