Catalyst6509 Multicast IGMP Flood问题处理

早上上班时查看网络运行情况,发现Catalyst6509出现了不少Log信息,都是关于Multicast方面的,同时也出现不少OSPF重新建立邻居关系的告警信息。下面对产生的信息做一个简单描述。

1、一个是MCAST-SP-6-GC_LIMIT_EXCEEDED,详细信息如下:
Jul 20 02:23:04: %MCAST-SP-STDBY-6-GC_LIMIT_EXCEEDED: IGMP snooping was trying to allocate more Layer 2 entries than what allowed (15488)
Jul 20 02:23:04: %MCAST-SP-6-GC_LIMIT_EXCEEDED: IGMP snooping was trying to allocate more Layer 2 entries than what allowed (15488)
在思科网站查关于MCAST-SP-6-GC_LIMIT_EXCEEDED错误信息,给出如下描述:
This error message is logged when the IGMP snooping function on the switch has created the maximum number of allowed Layer 2 (L2) entries. The default maximum number of L2 entries that the switch can create for multicast groups is 15,488. In later versions of Cisco IOS Software, only the hardware−installed L2 multicast entries count toward the limit. Refer to Cisco bug ID CSCdx89380 ( registered customers only) for more details. The issue is fixed in Cisco IOS Software Release 12.1(13)E1 and later.
建议的处理办法是:
You can manually raise the L2 limit. Issue the ip igmp l2−entry−limit command.

2、另外一个是MCAST-SP-6-L2_HASH_BUCKET_COLLISION,详细信息如下:
Jul 20 02:31:14: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0100.5e47.8f95,152)->0x9E8 Protocol :0 Error:3
Jul 20 02:31:30: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0100.5e40.5954,152)->0x9E8 Protocol :0 Error:3
Jul 20 02:31:49: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0100.5e50.6572,152)->0x9E8 Protocol :0 Error:3
Jul 20 02:31:57: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0100.5e71.459a,152)->0x9E8 Protocol :0 Error:3
Jul 20 02:32:02: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0100.5e17.63e5,152)->0x9E8 Protocol :0 Error:3
思科网站上给出的描述如下:
This message indicates that a Layer 2 entry was not installed in the hardware because there is not enough space in the hash bucket. Multicast packets are flooded on the incoming VLAN because the Layer 2 entry installation failed. When limit is exceeded, flooding occurs for additional group MACs.
建议的处理办法是:
If you do not use multicast, then you can disable IGMP snooping. Otherwise, you can increase the hash entry limit with the use of the ip igmp snooping l2−entry−limit command.

没想到6509 Version 12.2(18)SXF16版本还有这个问题,幸好6509上未启用Multicast,所以就直接把IGMP snooping关掉了,之后经过观察6509工作正常了。

posted on 2009-07-23 08:55 梯玛 阅读(1422) 评论(3)  编辑 收藏 引用 所属分类: 网络知识

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# re: Catalyst6509 Multicast问题处理 2009-07-25 16:29 99书城

不错啊!  回复  更多评论   

# re: Catalyst6509 Multicast问题处理 2009-07-25 16:34 罗莱家纺

来学习东西啊!  回复  更多评论   

# re: Catalyst6509 Multicast问题处理 2009-08-04 12:32 戴尔电脑

但看了方可四大皆空发神经登记费多少  回复  更多评论   

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