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Cisco Bug: CSCur46205 - Disable IGMP Snooping on FI causes Multicast MAC's mapped to Port Drop

Last Modified

Jan 29, 2017

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.1(3a)A

Description (partial)

Symptom:
-disable IGMP Snooping causes the below
-this was seen on a 6248 in production with 2.1(3a) firmware

us01-ucs5-A(nxos)# show mac addre vlan 2610
Legend:
        * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC
        age - seconds since last seen,+ - primary entry using vPC Peer-Link
   VLAN     MAC Address      Type      age     Secure NTFY    Ports
---------+-----------------+--------+---------+------+----+------------------
* 2610     0050.5661.6de4    dynamic   0          F    F  Veth2426
* 2610     0050.5661.9de7    dynamic   0          F    F  Veth2362
* 2610     0050.5661.fad2    dynamic   0          F    F  Veth2378
* 2610     0050.5662.1966    dynamic   0          F    F  Veth2266
* 2610     0050.5662.63f6    dynamic   0          F    F  Veth2442
* 2610     0050.5662.9bf7    dynamic   0          F    F  Veth2298
* 2610     0050.5662.f887    dynamic   0          F    F  Veth2434
* 2610     0050.5664.2139    dynamic   0          F    F  Veth2450
* 2610     0050.5664.6c9e    dynamic   0          F    F  Veth2386
* 2610     0050.5664.7b0f    dynamic   0          F    F  Veth2402
* 2610     0050.5664.e0a5    dynamic   0          F    F  Veth2354
* 2610     0050.5666.2b2a    dynamic   0          F    F  Veth2410
* 2610     0050.5666.6657    dynamic   0          F    F  Veth2338
* 2610     0050.5666.66e8    dynamic   0          F    F  Veth2418
* 2610     0050.5666.e967    dynamic   0          F    F  Veth2314
* 2610     0050.5667.4be0    dynamic   0          F    F  Veth2282
* 2610     0050.5668.9d50    dynamic   0          F    F  Veth2330
* 2610     0050.5669.35c7    dynamic   0          F    F  Veth2346
* 2610     0050.5669.52f6    dynamic   0          F    F  Veth2306
* 2610     0050.5669.65d0    dynamic   0          F    F  Veth2458
* 2610     0050.5669.af98    dynamic   0          F    F  Veth2290
* 2610     0050.566a.4653    dynamic   0          F    F  Veth2370
* 2610     0050.566d.9968    dynamic   0          F    F  Veth2322
* 2610     0050.566f.54d2    dynamic   0          F    F  Veth2394
  2610     0100.5e00.2003    igmp      0          F    F  drop
  2610     0100.5e00.2006    igmp      0          F    F  drop
  2610     0100.5e00.2008    igmp      0          F    F  drop
  2610     0100.5e00.2009    igmp      0          F    F  drop
  2610     0100.5e00.200a    igmp      0          F    F  drop
  2610     0100.5e00.200e    igmp      0          F    F  drop
  2610     0100.5e00.200f    igmp      0          F    F  drop

Conditions:
-6248
-2.1(3a) firmware
-IGMP snooping disabled
-ESXi 5.5 U2 w/ VXLAN
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