Problem with SPAN ports after vMotion

[ryan.lambert]

Hi all,

Quick question regarding something I am seeing.

We are running 1000v version 4.0(4)SV1(2), and we have a SPAN session setup between two VM guests, both running on virtual ethernet interfaces. The problem we seem to be running into is that when we vmotion the guests off of one host and onto another, although they remain on the same veth interfaces and the same hosts, the SPAN session seems to partially "break". On the destination interface, we only seem to be seeing traffic that would be coming via the ingress direction to the veth, and not egress - ie: only traffic originated FROM that server, and not TO it.

Has anyone seen similar behavior? Fixes, workarounds? Here's my simple SPAN config, for reference -

monitor session 3
  description File Monitor
  source interface Vethernet138 both
  destination interface Vethernet164
  no shut

Thanks everyone.

-Ryan

[dersoz]

Hi Ryan,

Probably a shut/noshut on the session would put it back in a proper state.

To look at the problem further, could you post the vemlogs on the host that the session is running on during problem state? Do these on the host:

% vemlog debug sfspan d

% !! wait for about a minute !!

% vemlog show all > vemlog_span.log

If you don't want to post it here, you can send it to me at dersoz@cisco.com and I can help you more with this.

Thanks,

Deniz