Maximum Supported Frame Size - HP Aruba JL253A Management And Configuration Manual

1. On remote switch C, configure the remote mirroring endpoint using port B10 as the exit port for a traffic
analyzer (as described in Configure a mirroring destination on a remote switch on page 431):
Figure 77: Configuring a remote mirroring endpoint
2. On source switch A, configure session 2 to use UDP port 9400 to reach the remote mirroring endpoint on
switch C (10.10.40.1):
mirror 2 remote ip 10.10.10.119 9400 10.10.40.1
3. On source switch A, configure the local port C12 to select all inbound traffic to send to the preconfigured
mirroring destination for session 2:
interface c12 monitor all in mirror 2
Figure 78: Configuring a remote mirroring session for inbound port traffic

Maximum supported frame size

The IPv4 encapsulation of mirrored traffic adds a 54-byte header to each mirrored frame. If a resulting frame
exceeds the MTU allowed in the network, the frame is dropped or truncated.
NOTE:
Oversized mirroring frames are dropped or truncated, according to the setting of the [truncation]
parameter in the mirror command. Also, remote mirroring does not allow downstream devices in a
mirroring path to fragment mirrored frames.
If jumbo frames are enabled on the mirroring source switch, the mirroring destination switch and all
downstream devices connecting the source switch to the mirroring destination must be configured to
support jumbo frames.
Chapter 12 Monitoring and Analyzing Switch Operation 443