[root@sniffer2 centos]# ip link add dev erspan1 mtu 9100 type erspan seq key 1 erspan_ver 1
[root@sniffer2 centos]# ip link set erspan1 up
[root@sniffer2 centos]# ifconfig erspan1
erspan1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9100
        inet6 fe80::14f6:cbff:fecb:46db  prefixlen 64  scopeid 0x20<link>
        ether 16:f6:cb:cb:46:db  txqueuelen 1000  (Ethernet)
        RX packets 2235281  bytes 311850140 (297.4 MiB)
        RX errors 4042724  dropped 2323  overruns 4042724  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 5  dropped 0 overruns 0  carrier 0  collisions 0

[root@sniffer2 centos]# cat /proc/sys/net/core/netdev_max_backlog
1000
[root@sniffer2 centos]# cat /proc/sys/net/core/rmem_default
212992
[root@sniffer2 centos]# ethtool -g erspan1
Ring parameters for erspan1:
Cannot get device ring settings: Operation not supported