IPV6互联不通

不涉及

ipv6业务，5560X与6520 ipv6直连不通， 6520与其余型号比如6520 ipv6直连可以通。且这台5560X对接<span lang="EN-US" calibri",sans-serif;color:#1f497d'="" style="margin: 0px; padding: 0px; word-break: break-all;">6520X就可以通，<span lang="EN-US" calibri",sans-serif;color:#1f497d'="" style="margin: 0px; padding: 0px; word-break: break-all;">6520就不行。ipv4的业务都正常。

互连接口为Route-Aggregation 40，带源ping不通回显：

1、查看ipv6邻居学习情况：

  ===============display ipv6 neighbors all=============== 

Type: S-Static    D-Dynamic    O-Openflow     R-Rule    IS-Invalid static

IPv6 address              MAC address    VLAN/VSI   Interface     State T  Aging

xxxxxxxxxxxxxxxx      542b-de48-xxxx     --           RAGG40     REACH D  601 

  ===============display ipv6 neighbors all=============== 

Type: S-Static    D-Dynamic    O-Openflow     R-Rule    I-Invalid

IPv6 address                   Link layer          VID    Interface         State    T  Age

xxxxxxxxxxxxxxxx        9820-443b-xxxx   N/A    RAGG40         STALE   D  569  

两交换机都能学习到对应表项，且都无误。

2、检查接口下配置：

#

interface Ten-GigabitEthernet1/0/25

port link-mode route

description to-Jiangmen

port link-aggregation group 40

#

interface Route-Aggregation40

description to-Jiangmen

ip address xxxxxxxx 255.255.255.252

pim sm

isis ipv6 enable 1

ipv6 address xxxxxxxxx

#

interface Ten-GigabitEthernet2/0/3

port link-mode route

description to-Heshan

port link-aggregation group 40

#

interface Route-Aggregation40

description to-Heshan

ip address xxxxxxxx 255.255.255.252

pim sm

isis ipv6 enable 1

ipv6 address xxxxxxxxx

接口并无特殊配置.

3、 display stp abnormal-port检查stp情况：

============================== 

 ---[Bridge-Aggregation1]---

    MST ID   BlockReason                     Time

    0        Disputed                        16:18:25 10/18/2022

    0        Disputed                        16:17:14 10/18/2022

    0        Disputed                        16:13:24 10/18/2022

---[Bridge-Aggregation2]---

    MST ID   BlockReason                     Time

    0        Disputed                        16:18:25 10/18/2022

    0        Disputed                        16:17:14 10/18/2022

    0        Disputed                        16:13:24 10/18/2022

---[Bridge-Aggregation3]---

    MST ID   BlockReason                     Time

    0        Disputed                        16:18:25 10/18/2022

    0        Disputed                        16:17:14 10/18/2022

    0        Disputed                        16:13:24 10/18/2022

---[Bridge-Aggregation7]---

    MST ID   BlockReason                     Time

    0        Disputed                        16:18:25 10/18/2022

    0        Disputed                        16:13:24 10/18/2022

    0        Disputed                        16:11:56 10/18/2022

互连接口并无被stp dispute。

4、debugging ipv6 packet查看ipv6报文收发情况：

<5560x>debugging ipv6 packet

<5560x>T M

The current terminal is enabled to display logs.

<5560x>T D

The current terminal is enabled to display debugging logs.

<5560x>ping ipv6 -a xxxxxxx  xxxxxx

Ping6(56 data bytes) xxxxxxx--> xxxxxx, press CTRL+C to break

*Mar 14 09:55:47:080 2024 Heshan.134.121 IP6FW/7/IP6FW_PACKET: 

 LocalSending, version = 6, traffic class = 0,

 flow label = 0, payload length = 64, protocol = 58, hop limit = 64, 

Src = xxxxxxxx, Dst = xxxxxxx, 

prompt: Output an IPv6 Packet. 

 *Mar 14 09:55:47:080 2024 Heshan.134.121 IP6FW/7/IP6FW_PACKET: 

 Sending, interface = Route-Aggregation40, version = 6, traffic class = 0, 

flow label = 0, payload length = 64, protocol = 58, hop limit = 64, 

Src = xxxxxxxxx, Dst = xxxxxxxxxx, 

prompt: Sending the packet from local interface Route-Aggregation40.

<6520>ping ipv6 -a xxxxxxxx xxxxxx

Ping6(56 data bytes) xxxxxxx --> xxxxxxx, press CTRL_C to break 

*Mar 14 10:04:56:749 2024 Jiangmen.134.119 IP6FW/7/IP6FW_PACKET: 

 LocalSending, version = 6, traffic class = 0, 

flow label = 0, payload length = 64, protocol = 58, hop limit = 64, 

Src = xxxxx, Dst = xxxxxxx, 

prompt: Output an IPv6 Packet. 

 *Mar 14 10:04:56:749 2024 Jiangmen.134.119 IP6FW/7/IP6FW_PACKET: 

 Sending, interface = Route-Aggregation40, version = 6, traffic class = 0, 

flow label = 0, payload length = 64, protocol = 58, hop limit = 64, 

Src = xxxxxxxx, Dst = xxxxxxx, 

prompt: Sending the packet from local interface Route-Aggregation40. 

debug看两边交换机都是有发没收。

<span lang="EN-US" calibri",sans-serif'="" style="margin: 0px; padding: 0px; word-break: break-all;">5、后经远程排查，问题已初步确认：现场S5560X设备g1/0/4存在大量的未知组播组报文，并且设备对应vlan内开启了igmp-snooping相关配置，由于该vlan内无对应的组播接收者，会有大量组播报文上送cpu。这个未知源组播和访问slot1的icmpv6在硬件上是公用一个限速器，导致<span lang="EN-US" calibri",sans-serif'="" style="margin: 0px; padding: 0px; word-break: break-all;">slot 1上ping S5560X本身接口ipv6地址的报文被挤占丢弃。该问题只影响访问设备本身的非协议<span lang="EN-US" calibri",sans-serif'="" style="margin: 0px; padding: 0px; word-break: break-all;">ipv6报文，过路转发的ipv6报文不受影响。

 igmp-snooping source-deny