LACP MAC Movement and Doubts

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Announcements
Please sign in to see details of an important advisory in our Customer Advisories area.

LACP MAC Movement and Doubts

L2 Linker

Dear Folks, 

 

First time I'm deploying PAs with LACP active/passive for HA solutions. I have some doubts couldn't get enough information from Internet source. 

 

1.  In the event, if one firewall goes down, PC on SW1 goes down, how this mac and arp movement happening?

     Interestingly when I give show interface on PA's both FW1 & 2 sharing same AE MAC, so wondering how MAC[GARP] movement       will kick in during FO event. 

 

Ramakrishnan_3-1702285551757.png

2. When I see lacp on PAFW1and2's what does mean system MAC and Partner MAC, in fact I couldn't see any ware in the switch. Where I get those details to study more about this?

Pre-negotiation: Enabled
Local: System Priority: 32768
System MAC: D:A:B:C:1a:01
Key: 66
Partner: System Priority: 65534
System MAC: A:B:C:D19:34:00
Key: 1

3. LACPDUs message are seeing [Sent and Recv counters are getting increase] on both fws. Why passive fw also doing LACPDUs sending and participating LACP election? 

 

 

1 accepted solution

Accepted Solutions

Community Team Member

Hi @Ramakrishnan ,

 

The switch will learn of the passive only if a failover happens, at which point the (formerly passive) firewall will send a gratuitous ARP which will tell the switch to forward packets on the new port even though the IP and MAC are the same.

 

https://live.paloaltonetworks.com/t5/Management-Articles/Gratuitous-ARP-in-HA-Failover/ta-p/62781

https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000sah9CAA&lang=en_US%E2%80%A...

https://live.paloaltonetworks.com/t5/general-topics/ha-active-passive-mac-address/td-p/227316

 

Passive Device:

—LACP or LLDP is not configured on the interface and the firewall does not participate in the protocol, but allows the peers on either side of the firewall to pre-negotiate LACP or LLDP, respectively:

https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/high-availability/ha-concepts/lacp-and-ll...

 

Kind regards,

-Kim.

 

LIVEcommunity team member, CISSP
Cheers,
Kiwi
Please help out other users and “Accept as Solution” if a post helps solve your problem !

Read more about how and why to accept solutions.

View solution in original post

1 REPLY 1

Community Team Member

Hi @Ramakrishnan ,

 

The switch will learn of the passive only if a failover happens, at which point the (formerly passive) firewall will send a gratuitous ARP which will tell the switch to forward packets on the new port even though the IP and MAC are the same.

 

https://live.paloaltonetworks.com/t5/Management-Articles/Gratuitous-ARP-in-HA-Failover/ta-p/62781

https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000sah9CAA&lang=en_US%E2%80%A...

https://live.paloaltonetworks.com/t5/general-topics/ha-active-passive-mac-address/td-p/227316

 

Passive Device:

—LACP or LLDP is not configured on the interface and the firewall does not participate in the protocol, but allows the peers on either side of the firewall to pre-negotiate LACP or LLDP, respectively:

https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/high-availability/ha-concepts/lacp-and-ll...

 

Kind regards,

-Kim.

 

LIVEcommunity team member, CISSP
Cheers,
Kiwi
Please help out other users and “Accept as Solution” if a post helps solve your problem !

Read more about how and why to accept solutions.
  • 1 accepted solution
  • 457 Views
  • 1 replies
  • 0 Likes
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the LIVEcommunity as a whole!

The LIVEcommunity thanks you for your participation!