Enabling Jumbo Frames To Increase The Mirroring Path Mtu; Effect Of Downstream Vlan Tagging On Untagged, Mirrored Traffic - HP Aruba JL253A Management And Configuration Manual

For arubaos-switch 16.08
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Enabling jumbo frames to increase the mirroring path MTU

On 1-Gbps and 10-Gbps ports in the mirroring path, you can reduce the number of dropped frames by enabling
jumbo frames on all intermediate switches and routers. (The MTU on the switches covered by this manual is 9220
bytes for frames having an 802.1Q VLAN tag, and 9216 bytes for untagged frames.)
Table 30: Maximum frame sizes for mirroring
Frame type
configuration
Untagged
Non-jumbo (default
config.)
Jumbo on all VLANs
Jumbo
source VLAN
Tagged
Non-jumbo
Jumbo
Jumbo
source VLAN
1
Jumbo frames are allowed on ports operating at or above 1 Gbps
2
For local mirroring, a non-jumbo configuration on the source VLAN dictates an MTU of 1518 bytes for untagged frames, and
an MTU of 1522 for tagged frames, regardless of the jumbo configuration on any other VLANs on the switch.
Effect of downstream VLAN tagging on untagged,
mirrored traffic
In a remote mirroring application, if mirrored traffic leaves the switch without 802.1Q VLAN tagging, but is
forwarded through a downstream device that adds 802.1Q VLAN tags, the MTU for untagged mirrored frames
leaving the source switch is reduced below the values shown in Maximum frame sizes for mirroring.
444
Maximum
frame size
1518
9216
11
On all but
1518
1522
11
on all VLANs
9220
11
On all but
1522
VLAN tag
Frame
mirrored
to local
port
Data
0
1518
0
9216
0
n/a
4
1522
4
9218
4
n/a
Aruba 2930F / 2930M Management and Configuration Guide
Frame mirrored to remote
port
Data
IPv4 header
1464
54
9162
54
1464
54
1468
54
9164
54
22
1468
54
for ArubaOS-Switch 16.08

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