NE40E接口ipv6地址ping不通

发布时间:  2016-06-20 浏览次数:  119 下载次数:  0
问题描述

组网描述:

华三16k----NE40E-X8  在华三设备带loopback接口地址ping NE40E接口的ipv6地址不通

 

告警信息
处理过程

1、  配置如下:

interface GigabitEthernet2/0/2

description 1G_to_hangzhoulunte_access_wasu_10-BRAS-ipv6-0/3/3

undo shutdown

ipv6 enable

ip address 1.1.1.1 255.255.255.252

ipv6 address 2001:DA8:B4:FF00::1/64   //华三设备配置2001:DA8:B4:FF00::2/64

ipv6 netstream sampler fix-packets 100 inbound

port-mirroring inbound

    port-mirroring outbound

路由信息如下:

 

2、  抓包信息如下:

抓包测试是先带原地址(2401:CE00::64ping20个, 然后直接ping20个, 目的地址是华为接口地址(2001:DA8:B4:FF00::1

互联地址ping有回包

 

带源2401:CE00::64ping 只有收包没有回包

 

根因

登陆设备发现2号槽位上对应的路由fib表项下发不成功,且2号槽位,3号槽位,8号槽位都处于超限转发的状态。

 

接口震荡后接口板会刷新对应的fib表项。

 

[hzh-hw-diagnose]display   ipv6  fib  1  2401:CE00::64  verbose

Route Entry Count: 1

Destination:  2401:CE00::                             PrefixLength : 32

Nexthop    :  2001:DA8:B4:FF00::2                     Flag         : DGU

Interface  :  [No Intf]                               Tunnel ID    : 0x0

TimeStamp  :  Date- 1:6:2016, Time- 18:21:43          ATIndex      : 0x0

Slot       :  2                                       InLabel      : NULL

IP6Token   :  0x1007                                  VlanId       : 0

RefCount   :  0                                       BgpKey       : 48

NexthopBak :  ::                                      IP6TokenBak  : 0x0

IfIndexBak :  [No Intf]                               Tunnel ID Bak: 0x0

BgpKeyBak  :  0                                       InLabelBak   : NULL

TokenForLabelBak  :  0x0                              UnrType      : 0

NexthopForLabelBak:  ::

IfIndexForLabelBak:  [No Intf]                        OriginAs     : 24139

BgpNexthop :  2001:DA8:B4:FF00::2                     PeerAs       : 24139

 

[hzh-hw-diagnose]display ipv6 fib 2 2401:CE00::64 verbose

Route Entry Count: 1

Destination:  ::                                      PrefixLength : 0

Nexthop    :  2001:DA8:1:515::1                       Flag         : GSU

Interface  :  [No Intf]                               Tunnel ID    : 0x0

TimeStamp  :  Date- 1:6:2016, Time- 0:0:3             ATIndex      : 0x0

Slot       :  1                                       InLabel      : NULL

IP6Token   :  0x1000                                  VlanId       : 0

RefCount   :  0                                       BgpKey       : 0

NexthopBak :  ::                                      IP6TokenBak  : 0x0

IfIndexBak :  [No Intf]                               Tunnel ID Bak: 0x0

BgpKeyBak  :  0                                       InLabelBak   : NULL

TokenForLabelBak  :  0x0                              UnrType      : 0

NexthopForLabelBak:  ::

IfIndexForLabelBak:  [No Intf]                        OriginAs     : 0

BgpNexthop :  ::                                      PeerAs       : 0

 

 

[hzh-hw-diagnose]display    ipv6  fib  overload   state    slot     1

  Overload mode:

    Overload forward mode.

  Overload state:

    Normal state.

 

[hzh-hw-diagnose]display ipv6 fib overload state slot 2

  Overload mode:

    Overload forward mode.

  Overload state:

    Overload forward state.

 

[hzh-hw-diagnose]display ipv6 fib overload state slot 3

  Overload mode:

    Overload forward mode.

  Overload state:

    Overload forward state.

 

 

[hzh-hw-diagnose]display ipv6 fib overload state slot 8

  Overload mode:

    Overload forward mode.

  Overload state:

    Overload forward state.

 

 

[hzh-hw-diagnose]display  ipv6   fib    2  statistics    all ——2号,3号及8号单板底层的ipv6 fib表项都只有24K

IPv6 FIB Route Prefix Capacity : 24576

IPv6 FIB Total Route Prefix Count : 24576; Entry Count : 24577

 

IPv6 FIB Public Route Prefix Count : 24576; Entry Count : 24577

 

[hzh-hw-diagnose]display ipv6 fib 3  statistics     all

IPv6 FIB Route Prefix Capacity : 24576

IPv6 FIB Total Route Prefix Count : 24575; Entry Count : 24576

 

IPv6 FIB Public Route Prefix Count : 24575; Entry Count : 24576

 

[hzh-hw-diagnose]display ipv6 fib 8 statistics all

IPv6 FIB Route Prefix Capacity : 24576

IPv6 FIB Total Route Prefix Count : 24576; Entry Count : 24577

 

IPv6 FIB Public Route Prefix Count : 24576; Entry Count : 24577

 

[hzh-hw-diagnose]display ipv6 fib 1 statistics all

IPv6 FIB Route Prefix Capacity : 1228800

IPv6 FIB Total Route Prefix Count : 30220; Entry Count : 30221

 

IPv6 FIB Public Route Prefix Count : 30220; Entry Count : 30221

 

[hzh-hw]display   ipv6   routing-table   statistics  

Summary Prefixes : 30215

Protocol   route       active      added       deleted     freed

DIRECT     79          79          88685391    88685312    88685312  

STATIC     45          44          60          15          15        

RIPng      0           0           0           0           0         

OSPFv3     622         615         1688559     1687937     1687937   

IS-IS      0           0           0           0           0         

BGP        29479       29479       8061963     8032484     8032484    ——BGP的路由数量较多。

UNR        0           0           0           0           0         

Total      30225       30217       98435973    98405748    98405748  

 

单板支持的ipv6表项规格超限了,导致路由下发到fib表失败,导致ping测试不通

解决方案

1)、通过路由策略过滤等方式减少设备上路由数量,降低路由数量到接口板FIB容限以下后进行IPv6 FIB超限转发恢复,参考如下:

 

1.  执行命令system-view,进入系统视图。

2.  执行命令recover ipv6 fib overload forward slot slot-id,对指定接口板进行超限转发恢复。

http://localhost:7890/pages/30004493/01/30004493/01/resources/Public_ne40e/public_sys-resources/icon-note.gif说明:

当对IPv6 FIB模块配置了超限转发恢复后,必须对IPv6 FIB模块刷新,以保证超限转发恢复策略在接口板上生效。

3.  执行命令refresh ipv6 fib slot slot-id,刷新IPv6 FIB,使超限转发恢复策略应用到指定接口板。

 

 

2)、割接部分业务到1号槽位单板(IPV6 FIB规格相对较大)或者更换2号槽位单板为其他IPV6 FIB规格较大的单板。客户将业务割接到1槽位单板,问题解决了

建议与总结

1、对于ipv6业务不通,查看单板支持的表项是否超载;fib表项是否下发成功

2、对于ipv6业务,如果路由信息比较多,建议使用规格较大的单板

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