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Cisco Bug: CSCvu89486 - Ethanalyzer not capturing OSPF packets from M3 modules using capture-filter

Last Modified

Jul 30, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

8.2(5) 8.4(1) 8.4(2)

Description (partial)

Symptom:
Ethanalyzer is not capturing OSPF packets coming from M3 modules using capture-filters

This output shows that our Nexut 7K router has an M3 module in slot 3:

core9-1# show module
Mod  Ports  Module-Type                         Model              Status
---  -----  ----------------------------------- ------------------ ----------
1    0      Supervisor Module-2                 N7K-SUP2E          active *
2    0      Supervisor Module-2                 N7K-SUP2E          ha-standby
3    48     1/10 Gbps Ethernet Module           N7K-M348XP-25L     ok
4    6      10/40 Gbps Ethernet Module          N7K-M206FQ-23L     ok
5    6      10/40 Gbps Ethernet Module          N7K-M206FQ-23L     ok
6    24     10 Gbps Ethernet Module             N7K-M224XP-23L     ok

This is the configuration of vlan 3086:
core9-1# show run int vlan 3086


version 8.4(1)

interface Vlan3086
  description core91-bd111grn-lnk
  no shutdown
  mtu 9000
  ipv6 flow monitor Campus-Monitor-v6 input sampler Campus-Sampler
  ip address 172.20.105.73/30
  ip ospf cost 1000
  ip ospf network point-to-point
  ip router ospf 1 area 0.0.0.0
  ip pim sparse-mode

core9-1# show ip ospf neighbors vlan 3086
 OSPF Process ID 1 VRF default
 Total number of neighbors: 1
 Neighbor ID     Pri State            Up Time  Address         Interface
 172.20.19.246     1 FULL/ -          30w2d    172.20.105.74   Vlan3086

it works with display-filters:

OSPF# ethanalyzer local interface inband capture-filter "host 172.20.105.74 and ip proto 89" limit-captured-frames 0
Capturing on inband

OSPF# ethanalyzer local interface inband display-filter "ip.src==172.20.105.74 and ospf" limit-captured-frames 0
Capturing on inband
1 2020-07-05 10:38:16.283090 172.20.105.74 -> 224.0.0.5    OSPF 82 Hello Packet
1 2020-07-05 10:38:24.033186 172.20.105.74 -> 224.0.0.5    OSPF 82 Hello Packet

Conditions:
7ks with M3 modules
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