Switched UNI Interface + LACP + SLPP + Untagged Frames Discard + Default VLAN 0

[Anonymous]

Hi,

Looking through the Extreme Automated Campus EVD: 

https://www.extremenetworks.com/resources/extreme-validated-design/extreme-automated-campus/

It uses switched UNI’s for connections to servers using the example configuration below:

mlt 1 enable
mlt 1 member 1/13
mlt 1 encapsulation dot1q
mlt 2 enable
mlt 2 member 1/20
mlt 2 encapsulation dot1q

interface mlt 1
smlt
flex-uni enable
exit
interface mlt 2
smlt
flex-uni enable

interface GigabitEthernet 1/13
flex-uni enable
no shutdown
no spanning-tree mstp
yes
exit
interface GigabitEthernet 1/20
flex-uni enable
no shutdown
no spanning-tree mstp
yes
exit

i-sid 1090901 elan
c-vid 901 mlt 1
exit
i-sid 1090902 elan
c-vid 902 mlt 1
c-vid 902 mlt 2
exit

This is using a static MLT but I was considering using LACP, so my configuration looks a little like the below:

mlt 306 enable
mlt 306 encap dot1
mlt 306 name "Dell M1000e Chassis-B36-Rack5-A1"

interface mlt 306
lacp key 306
lacp enable
flex-uni enable
smlt
exit

interface gigabitEthernet 3/6
flex-uni enable
encap dot1
untagged-frames-discard
default-vlan-id 0
name "Dell M1000e Chassis-B36-Rack5-SwA1"
slpp packet-rx 
slpp packet-rx-threshold 50
lacp key 306
lacp aggregation enable
lacp mode active
lacp enable
no spanning-tree mstp
exit

interface gigabitEthernet 4/6
flex-uni enable
encap dot1
untagged-frames-discard
default-vlan-id 0
name "Dell M1000e Chassis-B36-Rack5-SwA1"
slpp packet-rx 
slpp packet-rx-threshold 50
lacp key 306
lacp aggregation enable
lacp mode active
lacp enable
no spanning-tree mstp
exit

i-sid 12110499 elan 
c-vid 499 mlt 306
exit

i-sid 12110703 elan 
c-vid 703 mlt 306
exit

As you can see my configuration has quite a few additions, some like the untagged frames discard, default vlan 0, SLPP used trying to adopt best practise - whether that required or not in this instance is up for question. This is the list of commands added to that provided in the EVD:

• LACP
• untagged-frames-discard
• default-vlan-id 0
• slpp
• encap dot1q

What I’m not sure is if there are any caveats to using LACP, or any of those others commands when used generally or in conjunction with a switched UNI rather then say a VLAN UNI?

Many thanks in advance

[Ludovico_Steven · Accepted solution]

On a flex-uni port, these settings are irrelevant:

• encap dot1q
• untagged-frames-discard (also tagged-frames-discard)
• default-vlan-id 0

The default-vlan-id is always 0 and encap dot1q shows as set on a flex-uni port.

The untagged-frames-discard can be set either way, but does nothing.

It is the existence or not of an untagged i-sid binding on the port which will determine whether untag traffic is handled on the port.

LACP and SLPP/SLPP-Guard are supported on flex-uni ports.

On a separate note, on a CVLAN UNI tagged port, both these settings achieve the same, in terms of dropping incoming untagged packets:

• untagged-frames-discard
• default-vlan-id 0