Suggested Answer:D🗳️
The Erspan-id needs to match between the switches. The ג€monitor sessionג€ ID is only locally significant and does not need to match on each device. Reference: https://www.letsconfig.com/how-to-configure-erspan-on-cisco-nexus-switches/
D is correct
The following factors are applicable while using ERSPAN as a local SPAN:
Both sessions have the same ERSPAN ID.
Both sessions have the same IP address. This IP address is the router’s own IP address; that is, the loopback IP address or the IP address configured on any port.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-16/lanswitch-xe-16-book/lnsw-conf-erspan.html
refer site: https://docs.google.com/document/d/1nCz7jJ9Mu-J_LwfwUmeoPjzrNRZgeyfaeAACSzrBa9k
D is correct
The following factors are applicable while using ERSPAN as a local SPAN:
Both sessions have the same ERSPAN ID.
Both sessions have the same IP address. This IP address is the router’s own IP address; that is, the loopback IP address or the IP address configured on any port.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-16/lanswitch-xe-16-book/lnsw-conf-erspan.html
Assuming that session-id is the same and then set as the view's command, packets captured by host A are sent to Eth 2/33, passing through L2 connection.
In other words, host A will be a "source" and host B will be a port analyzer (in cisco doc's term it named "Destination").
However, we can see the following instructions in Switch A.
"monitor session 48 type erspan-source"
And Switch B has the following instructions.
"monitor session 47 type erspan-destination"
That is, because the session-id value is not correct, Host B cannot obtain the captured packet from Host A.
Switch A may be possible by changing session-id to 47.
For this reason, I think the answer is A, not D.
refer site
1. configure ERSPAN
https://www.letsconfig.com/how-to-configure-erspan-on-cisco-nexus-switches/
2. in ERSPAN, if session-id is different between them?
https://forums.extrahop.com/t/erspan-session-id/2939
3. cisco ERSPAN docs
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/system-management/guide/b_Cisco_Nexus_7000_Series_NX-OS_System_Management_Configuration_Guide-RI/configuring_erspan.html?referring_site=RE&pos=1&page=https://www.cisco.com/c/ko_kr/support/docs/switches/nexus-7000-series-switches/113480-erspan-nexus-7k-00.html
Erspan-id needs to match between the switches, “monitor session” is only locally significant.
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