Comware

I am sorry for the inconvenience, but I would greatly appreciate your kind cooperation.

There were so many communities that I was not sure which was the appropriate community.so I posted it here anyway.

Q1.

I believe that loop violations can be detected by STP settings.

So why do I need the loop-protection setting ?

In what cases would the loop-protection setting be effective?

Q2.

On page 42 of
"https://www.arubanetworks.com/assets/_ja/support/cg/CG_OC1850SwitchSeries_24G-48G.pdf" 

Is the 09:00:09:09:13:A6 used in loop-protection used by aruba for a free MAC address?
Is it a MAC ADDRESS registered in IANA or IEEE standards?
When I search the internet, I can find information about 0180 , 0100 used in CISCO CDP and broadcast FFFF, 
but I can not find any information about 09:00:09:09:13:A6.

Q1:
There are situations where Spanning-Tree is unable to identify loops. E.g. an unmanaged switch is connected to switch port and this unmanaged switch does not support Spanning-Tree and also filter those Spanning-Tree packets. If you now create a loop by plugging a cable in port 1 and 2 of this unmanaged switch this loop cannot be detected by Spanning-Tree as those packets are filtered. In this situation the loop-protect functionality detect this loop.

Q2:

If you check on Wikipedia you see that MAC addresses starting with X9-XX-XX-XX-XX-XX are multicast (group) addresses which are universally administrated.  If you flip the first bit (Individual/Group) in the first octet to 0 you get the vendor OUI 08:00:09 and when you search this on the Internet that you will find it is assigned to Hewlett Packard. 

Original Message:
Sent: Oct 02, 2024 02:53 AM
From: katsuoume
Subject: Question with regard to loop-protection and MAC address 09:00:09:09:13:A6

I am sorry for the inconvenience, but I would greatly appreciate your kind cooperation.

There were so many communities that I was not sure which was the appropriate community.so I posted it here anyway.

Q1.

I believe that loop violations can be detected by STP settings.

So why do I need the loop-protection setting ?

In what cases would the loop-protection setting be effective?

Q2.

On page 42 of
"https://www.arubanetworks.com/assets/_ja/support/cg/CG_OC1850SwitchSeries_24G-48G.pdf" 

Is the 09:00:09:09:13:A6 used in loop-protection used by aruba for a free MAC address?
Is it a MAC ADDRESS registered in IANA or IEEE standards?
When I search the internet, I can find information about 0180 , 0100 used in CISCO CDP and broadcast FFFF, 
but I can not find any information about 09:00:09:09:13:A6.

I deeply appreciate your response.

I have an additional question.

Q3:
Is the loop-protection feature only available on HPE aruba ? 
I have not seen such a command on cisco , nvidia switches. 

Q4:

The multicast mac address starts with 01-00-5E, but I could not understand why it was 09:00:09:

Original Message:
Sent: Oct 03, 2024 07:08 AM
From: Holger Hasenaug
Subject: Question with regard to loop-protection and MAC address 09:00:09:09:13:A6

Q1:
There are situations where Spanning-Tree is unable to identify loops. E.g. an unmanaged switch is connected to switch port and this unmanaged switch does not support Spanning-Tree and also filter those Spanning-Tree packets. If you now create a loop by plugging a cable in port 1 and 2 of this unmanaged switch this loop cannot be detected by Spanning-Tree as those packets are filtered. In this situation the loop-protect functionality detect this loop.

Q2:

If you check on Wikipedia you see that MAC addresses starting with X9-XX-XX-XX-XX-XX are multicast (group) addresses which are universally administrated.  If you flip the first bit (Individual/Group) in the first octet to 0 you get the vendor OUI 08:00:09 and when you search this on the Internet that you will find it is assigned to Hewlett Packard. 

Original Message:
Sent: Oct 02, 2024 02:53 AM
From: katsuoume
Subject: Question with regard to loop-protection and MAC address 09:00:09:09:13:A6

I am sorry for the inconvenience, but I would greatly appreciate your kind cooperation.

There were so many communities that I was not sure which was the appropriate community.so I posted it here anyway.

Q1.

I believe that loop violations can be detected by STP settings.

So why do I need the loop-protection setting ?

In what cases would the loop-protection setting be effective?

Q2.

On page 42 of
"https://www.arubanetworks.com/assets/_ja/support/cg/CG_OC1850SwitchSeries_24G-48G.pdf" 

Is the 09:00:09:09:13:A6 used in loop-protection used by aruba for a free MAC address?
Is it a MAC ADDRESS registered in IANA or IEEE standards?
When I search the internet, I can find information about 0180 , 0100 used in CISCO CDP and broadcast FFFF, 
but I can not find any information about 09:00:09:09:13:A6.

Q3:
Other vendors might have also something like loop-protect. On Cisco look for keepalive. I don't know about Nvidia.

Q4:
01-00-5E is only the reserved MAC when IPv4 multicast is used. In general Ethernet frames with a value of 1 in the least-significant bit of the first octet of the destination MAC address are treated as multicast frames. 

Original Message:
Sent: Oct 03, 2024 11:26 AM
From: katsuoume
Subject: Question with regard to loop-protection and MAC address 09:00:09:09:13:A6

I deeply appreciate your response.

I have an additional question.

Q3:
Is the loop-protection feature only available on HPE aruba ? 
I have not seen such a command on cisco , nvidia switches. 

Q4:

The multicast mac address starts with 01-00-5E, but I could not understand why it was 09:00:09:

Original Message:
Sent: Oct 03, 2024 07:08 AM
From: Holger Hasenaug
Subject: Question with regard to loop-protection and MAC address 09:00:09:09:13:A6

Q1:
There are situations where Spanning-Tree is unable to identify loops. E.g. an unmanaged switch is connected to switch port and this unmanaged switch does not support Spanning-Tree and also filter those Spanning-Tree packets. If you now create a loop by plugging a cable in port 1 and 2 of this unmanaged switch this loop cannot be detected by Spanning-Tree as those packets are filtered. In this situation the loop-protect functionality detect this loop.

Q2:

If you check on Wikipedia you see that MAC addresses starting with X9-XX-XX-XX-XX-XX are multicast (group) addresses which are universally administrated.  If you flip the first bit (Individual/Group) in the first octet to 0 you get the vendor OUI 08:00:09 and when you search this on the Internet that you will find it is assigned to Hewlett Packard. 

Original Message:
Sent: Oct 02, 2024 02:53 AM
From: katsuoume
Subject: Question with regard to loop-protection and MAC address 09:00:09:09:13:A6

I am sorry for the inconvenience, but I would greatly appreciate your kind cooperation.

There were so many communities that I was not sure which was the appropriate community.so I posted it here anyway.

Q1.

I believe that loop violations can be detected by STP settings.

So why do I need the loop-protection setting ?

In what cases would the loop-protection setting be effective?

Q2.

On page 42 of
"https://www.arubanetworks.com/assets/_ja/support/cg/CG_OC1850SwitchSeries_24G-48G.pdf" 

Is the 09:00:09:09:13:A6 used in loop-protection used by aruba for a free MAC address?
Is it a MAC ADDRESS registered in IANA or IEEE standards?
When I search the internet, I can find information about 0180 , 0100 used in CISCO CDP and broadcast FFFF, 
but I can not find any information about 09:00:09:09:13:A6.