Tips and Pitfalls: SPAN / RSPAN

Basic RSPAN Example

Source Switch Destination Switch
int vsan 5

ip address 192.168.1.1 255.255.255.0

no shut

fc-tunnel enable
int fc-tunnel 1
source 192.168.1.2
destination 192.168.1.1
no shut
int fc1/16
switchport mode ST
rspan-tunnel interface fc-tunnel 1
no shut
span session 1
source interface fc1/5
destination interface fc-tunnel 1

int vsan 5

ip address 192.168.1.2 255.255.255.0
no shut
fc-tunnel enable

int fc1/15

switchport mode SD

switchport encap eisl
no shut
fc-tunnel tunnel-id-map 1 interface fc1/15

Key Points / Pitfalls

  • 0x71 is EPP, 0x77 is CFS
  • fc-tunnel enable must be set for all switches in the path
  • The docs say ip routing must be enabled. ┬áThis is not mandatory, but may be necessary depending on the path of your RSPAN.
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