Cisco 892FSP - SPAN Ports behavoir

[lauresfrank]

Dear Cisco-Community,

I try to mirror one uplink port (Gi8) of my Cisco892 to a switchport (Gi2). Is it a bug or a feature that I cannot mirror uplinks(Gi8-9), but switchports(Gi0-7) do work?

Uplink not working:

C892-(config)#monitor session 1 source interface gigabitEthernet ?
<0-9> GigabitEthernet interface number

C892-(config)#monitor session 1 source interface gigabitEthernet 8 
% Incomplete command.

C892-(config)#monitor session 1 source interface gigabitEthernet 8 ?
% Unrecognized command

Switchport works

C892-(config)#monitor session 1 source interface gigabitEthernet 7
C892-(config)#

Version:

Cisco IOS Software, C800 Software (C800-UNIVERSALK9-M), Version 15.5(3)M3, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Mon 20-Jun-16 13:57 by prod_rel_team

Cisco C892FSP-K9 (revision 1.0) with 488524K/35763K bytes of memory.
10 Gigabit Ethernet interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 32 bits wide
255K bytes of non-volatile configuration memory.
250880K bytes of ATA System CompactFlash (Read/Write)

Thank you!

[Philip D'Ath · Accepted solution]

I don't know the answer - but typically you can only monitor switch ports, not routed layer 3 ports.

[lauresfrank]

Thank you. So, I will switch from WAN uplink to access ports (with SVI) for my WAN connection.