Enabling Jumbo Frames To Increase Mirroring Path Mtu - HP ProCurve 6120G/XG Configuration Manual

Enabling Jumbo Frames To Increase 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 maximum transmission unit—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.) For information on configuring the switch for
jumbo frames, refer to "Configuring Jumbo Frame Operation" on page 12-22.
Table B-2. Maximum Frame Sizes for Mirroring
Frame Type
Configuration
Non-Jumbo
(default config.)
1
Jumbo on All VLANs
1
Jumbo On All But
Source VLAN
Non-Jumbo
1
Jumbo on All VLANs
1
Jumbo On All But
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.
Monitoring and Analyzing Switch Operation
Maximum VLAN Frame Mirrored
Frame Tag to Local Port
Size
Data
1518 0 1518
9216 0 9216
1518 0 n/a
1522 4 1522
9220 4 9218
1522 4 n/a
Traffic Mirroring
2
2
B-43