Allied Telesis x900-48FE-N User Manual
Page 29 | AlliedWare™ OS How To Note: EPSR
Classifiers and Hardware Filters
To see details, use the command:
show epsr=test
The following diagram shows the expected output.
Classifiers and Hardware Filters
On AT-8948, AT-9900, AT-9900s, and x900 series switches, the switching hardware has a limit
of 16 bytes to use for matching on incoming packets.
of 16 bytes to use for matching on incoming packets.
EPSR creates a hardware filter that uses 2 bytes for VLAN identification (since version
291-04). This means that you have to design your network carefully when using EPSR with
DHCP snooping, QoS, or other hardware filters.
291-04). This means that you have to design your network carefully when using EPSR with
DHCP snooping, QoS, or other hardware filters.
For example:
•
DHCP snooping uses 5 bytes to match on the source and destination UDP ports and the
protocol field. With EPSR and DHCP snooping both enabled, 7 out of the 16 bytes are
used.
protocol field. With EPSR and DHCP snooping both enabled, 7 out of the 16 bytes are
used.
•
IP addresses use 4 bytes. So if you configured EPSR, DHCP snooping, and a QoS policy
that classified on source IP address, then 11 of the 16 bytes would be used.
that classified on source IP address, then 11 of the 16 bytes would be used.
--- EPSR Domain Information ---------------------------------------------------
EPSR Domain Name...................... test
EPSR Domain Node Type................. Transit
EPSR Domain State..................... LINKS-UP
MAC Address of Master Node............ 00:00:CD:24:02:4F
EPSR Domain Status.................... Enabled
Control Vlan.......................... 1000
Ring Interface # 1.................... 5.0
Physical State of Ring Interface # 1.. UP
Ring Interface # 1 Type............... UPSTREAM
Ring Interface # 1 State.............. FORWARDING
Ring Interface # 2.................... 5.1
Physical State of Ring Interface # 2.. UP
Ring Interface # 2 Type............... DOWNSTREAM
Ring Interface # 2 State.............. FORWARDING
Hello Timer (seconds.................. N/A
Failover Timer (seconds).............. N/A
Ringflap Timer (seconds).............. N/A
Hello Time Remaining (seconds)........ N/A
Failover Time Remaining (seconds)..... N/A
Ringflap Time Remaining (seconds)..... N/A
Hello Sequence........................ N/A
Data Vlans............................ 2
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