Guest

Preview Tool

Cisco Bug: CSCus77170 - Sup2T-IPv6 MLD shows Incorrect Entries

Last Modified

Jan 05, 2018

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.1(1.2)

Description (partial)

Symptom:
Two 6500 switches connected  over  VPLS. One cat6k  gets duplicate entry for IPv6 memebership report over pseudowire. Please find the detail.


BGL14-1.C.06-6500-1#show ipv6 mld snooping querier
Vlan      IP Address               MLD Version   Port
-------------------------------------------------------------
41        FE80::4                  v2            Switch<< MLD elected Querier



BGL14-1.C.06-6500-1#show ipv6 mld snooping membership
Snooping Membership Summary for Vlan 41
------------------------------------------
Total number of channels: 5
Total number of hosts   : 4

Source/Group                                                                    Interface       Reporter                                Uptime   Last-Join/
                                                                                                                                                 Last-Leave
-------------------------------------------------------------------------------------------------------------------------------------------------------------

:                                                                                                                                                   -

::/FF02::1:FFBB:DBF3                                                            Gi5/3           FE80::20C:29FF:FEBB:DBF3                00:14:54 00:40:39 /
                                                                                                                                                 00:40:13

::/FF02::1:FF00:1                                                               PP2688          FE80::66AE:CFF:FE41:C40                 00:38:39 00:00:01 /
                                                                                                                                                     -

::/FF02::1:FF00:1                                                               PP2688          FE80::99E0:FA3F:DFB9:8F3A               00:01:29 00:05:32 /
                                                                                                                                                 00:04:02

::/FF02::1:FFB9:8F3A                                                            PP2688          FE80::66AE:CFF:FE41:C40                 00:38:38 00:00:01 /
                                                                                                                                                     -

::/FF02::1:FFB9:8F3A                                                            PP2688          FE80::99E0:FA3F:DFB9:8F3A               00:01:26 00:09:29 /
                                                                                                                                                 00:08:02



BGL14-1.C.08-6500-1#show ipv6 mld snooping querier
Vlan      IP Address               MLD Version   Port
-------------------------------------------------------------
41        FE80::4                  v2            PP2688

BGL14-1.C.08-6500-1#
BGL14-1.C.08-6500-1#
BGL14-1.C.08-6500-1#
BGL14-1.C.08-6500-1#show ipv6 mld snooping membership
Snooping Membership Summary for Vlan 41
------------------------------------------
Total number of channels: 5
Total number of hosts   : 3

Source/Group                                                                    Interface       Reporter                                Uptime   Last-Join/
                                                                                                                                                 Last-Leave
-------------------------------------------------------------------------------------------------------------------------------------------------------------

::/FF02::1:FF00:1                                                               Gi5/3           FE80::99E0:FA3F:DFB9:8F3A               00:38:20 00:00:11 /
                                                                                                                                                     -

::/FF02::1:FFB9:8F3A                                                            Gi5/3           FE80::99E0:FA3F:DFB9:8F3A               00:38:19 00:00:10 /
                                                                                                                                                     -

FE80::99E0:FA3F:DFB9:8F3A               <<< these is the Pcs Mac address  learned on gig5/3  Windows Pc

FE80::66AE:CFF:FE41:C40  <<<< These is the mac address of peer switch which sending duplicate entry.

BGL14-1.C.08-6500-1#show mac address-table

Legend: * - primary entry
        age - seconds since last seen
        n/a - not available
        S - secure entry
        R - router's gateway mac address entry
        D - Duplicate mac address entry

Displaying entries from active supervisor:

     vlan   mac address    type   learn    age                 ports
----+----+---------------+-------+-----+----------+-----------------------------
       41 001d.e5e5.e400  dynamic  Yes      230     VPLS peer 4.4.4.4(2:1)
*      41 0050.5687.092f  dynamic  Yes        5     Gi5/3
  R  N/A  64ae.0c41.0c40   static   No       -      Router<<<<<<<<<<<<<<<<
       41 000c.29d9.3ad1  dynamic  Yes      230     VPLS peer 4.4.4.4(2:1)

Conditions:
This issue is observed with Sup2T/15.1(2)SY2 &4
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.