SPAN Session Guidelines
The following are SPAN session guidelines:
- When a SPAN session contains multiple transmit source ports, packets that these ports receive may be replicated even though they are not transmitted on the ports. Examples include the following:
– Traffic that results from flooding
– Broadcast and multicast traffic
- For VLAN SPAN sessions with both receive and transmit configured, two packets (one from receive and one from transmit) are forwarded from the destination port if the packets get switched on the same VLAN.
- After VMotion:
– A session is stopped if the source and destination ports are separated.
– A session resumes if the source and destination ports end up on the same host.
- The following are required for a running SPAN session:
– The limit of 64 SPAN sessions is not exceeded.
– At least one operational source is configured.
– At least one operational destination is configured.
– The configured source and destination are on the same host.
– The session is enabled with the no shut command.
- A session is stopped if any of the following occur:
– All the source ports go down or are removed.
– All the destination ports go down or are removed.
– All the source and destination ports are separated by a VMotion.
– The session is disabled by a shut command.