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--- hardware:erspan [2018/05/01 21:37] – [On MTU and packet sizes] veera
+++ hardware:erspan [2018/05/01 21:38] (current) – [On MTU and packet sizes] veera
@@ Line 55: / Line 55: @@
-<note important>Make sure you increase the MTU of the path to accommodate the extra 42 bytes of tunnel header </note>
+<note important>Make sure you increase the MTU of the ERSPAN session and the IP path to accommodate the extra 42 bytes of tunnel header </note>
   - **mtu 1900**  -- ERSPAN adds about 42 bytes of extra header bytes by way of Ethernet/IP/GRE header. The default ERSPAN MTU is 1500 bytes, so when you mirror full length packets they can be truncated. Make sure you increase the MTU of the ERSPAN to 1700 or 1900 or even the maximum size of 9000 bytes.