erspan session keeps shutdown

alfonso.cornejo · ‎08-11-2009

Hi to all,

I've configured an erspan session between two Cat6509 but in the source, the monitor session is always "shutdown" and it doesn't change when i put the no shutdown command.

Here is the configuration:

SOURCE

monitor session 12 type erspan-source

shutdown ->***THIS IS THE ONE THAT NEVER GOES OUT***

source vlan 121

destination

erspan-id 112

ip address 10.233.48.228

origin ip address 10.233.48.248

DESTINATION

monitor session 12 type erspan-destination

destination interface Fa4/3

source

erspan-id 112

ip address 10.233.48.228

When i do a sh monitor session 12 detail it says in the status field Admin Disabled

Do you know what can be causing this?

Thanks in advance for your help.

alfonso.cornejo · ‎08-11-2009

*SOLVED*

The problem was that the next hop address of the source (10.233.48.228) was known by a tunnel and that is not supported by erspan, just have to take the destination address out of the tunnel.

Here is the cisco information:

%SPAN-5-ERSPAN_ADJ_TUNNEL: ERSPAN Destination behind a tunnel. Shutting down session [dec]

The next hop to the IP address specified as the ERSPAN destination lies behind a tunnel. This configuration is not supported. The ERSPAN session is shut down when such a configuration is detected.

Recommended Action: Specify another ERSPAN destination IP address that does not have a tunnel as the next-hop adjacency.

Related documents- No specific documents apply to this error message.

Hope this help someone in the future...