Guest

Preview Tool

Cisco Bug: CSCun40658 - Nexus 7700-SPAN capturing in one direction when VLAN in fabricpath mode

Last Modified

Feb 15, 2018

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(12) 6.2(2a) 6.2(6)

Description (partial)

Symptom:
In Nexus 7000 systems running 6.2.2a/6.2.6 code,  if fabric path traffic egressing out of a core port is captured using Egress SPAN sessions, the MiM header will not be stripped off at the SPAN destination. The reason for this particular enhancement is that, many times, capture the packet in its entirety,  including the MiM header is desirable. But in 6.2.2a and 6.2.6 releases, there was no option to let the user decide whether MiM header should be preserved or not. Some end analyzers are not able to detect/parse MiM headers, hence the scenario looked like no egress copies were being generated for traffic going out of a core port.
Hence, 6.2.8 on wards, a new per-port CLI was provided which lets the user decide whether MiM/other internal headers should be preserved for the SPAN copy or not. Command to be used is "switchport monitor exclude header". More details for the command is present in the configuration guide.

Conditions:
Nexus 7000/Nexus 7700 switches with 6.2.2a or 6.2.6, traffic egressing out of a core port is being copied in the Egress SPAN Session and end analyzer does not have capability to parse MiM header.

6.2.8 on wards,  traffic egressing out of a core port is being copied in the Egress SPAN Session, end analyzer does not have capability to parse MiM header and the CLI to enable stripping of internal headers "switchport monitor exclude header" is not applied on the SPAN destination port.
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.