Manual

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SwitchB (config-router)#exit
(4) Configure Device C (the destination device)
# Create interface Tunne1, and configure an IP address and mask for
it.
SwitchC(config)#interface tunnel 1
SwitchC (config-if-tunnel1)# tunnel mode gre ip
SwitchC (config-if-tunnel1)#ip address 50.1.1.2 255.255.255.0
# Configure Tunnel1 to operate in GRE tunnel mode, and configure
source and destination IP addresses for it.
SwitchC (config-if-tunnel1)# tunnel source 40.1.1.1
SwitchC (config-if-tunnel1)# tunnel destination 10.1.1.1
SwitchC (config-if-tunnel1)# exit
# Configure OSPF protocol.
SwitchC (config)#router ospf
SwitchC (config-router)#network 0.0.0.0/0 area 0
SwitchC (config-router)#exit
# Configure Ethernet 1/1 as a source port and Ethernet 1/2 as the
destination port of local mirroring group 1.
SwitchC (config)#monitor session 1 destination interface ethernet 1/2
SwitchC (config)#monitor session 1 source interface ethernet 1/1 rx
59.4 ERSPAN Troubleshooting
If problems occur when configuring ERSPAN, please check whether the problem is caused by
the following reasons:
 Make sure GRE tunnel configuration to ensure the normal transmission for the traffic.
 If the throughput of mirror destination port is smaller than the total throughput of mirror
source port(s), the destination port will not be able to duplicate the traffic of all source
port; please decrease the number of source ports, duplicate traffic for one direction
only or choose a port with greater throughput as the destination port.