Juniper srx reth mac address
What I would need is to be able to ping the upstream router from just the active node. When this fails the redundancy group containing just this reth interface would have to failover to the second node and start pinging from that.
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Switching back and forth could be restricted with the hold-down-interval. I will try to test this as soon as I have a setup for this but nothing comes into my mind at the moment as a workaround. Thanks for your help.
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I have updated the end of the post Steven. It must be checked in the X releases in which behavior might be different. Salman, What I have learned there is that my testing method is incorrect.
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- SRX cluster ip-monitoring!
- JUNOS: CHASSIS CLUSTERS – A BEGINNERS GUIDE TO JUNIPER SRX HIGH AVAILABILITY;
- Juniper SRX Series by Brad Woodberg, Rob Cameron.
I have only a single gateway and normally you should have at least two if you are really monitoring your uplinks. I am in a similar situation: I am familiar with this configuration in ScreenOS a much more mature operating system, for sure , where you simply pinged a gateway, or some upstream device and failed to the backup if you lost connectivity. Being said this, the downstream or upstream switches will definetely know how to handle those packets.
Based on the explanation provided on the SRX series book page , it appears to me that when you specify this interface and secondary-IP, the ICMP packets are going to use the specfied secondary IP as a source address and will come from the backup interface. What happens is the specified interface is different than the one included on the routing table as our outgoing interface to reach the monitored IP? How will the switches know how forward this packet to the backup interface if the source MAC should be the reth MAC address?
Re: Two Pairs of SRX Clusters on MAC Address Conflicts !
Not quite sure if I am getting you right. This site uses Akismet to reduce spam. Learn how your comment data is processed. Cluster ID: Redundancy group: Configured mode: Sep 19 Hold timer expired Sep 19 Redundancy mode: Operational mode: Something interesting happens to the names of the physical interfaces when you put a device into a HA pair. When you set up two devices in a Chassis Cluster, the two devices share one configuration file. Think about the consequences of that: To fix this problem, Junos renames the interfaces on the Secondary interface.
You see, what exactly this number changes to depends on the model of firewall. These two lines make the fabric link work. We define two virtual fabric interfaces, and then assign a physical interface on each firewall to them.
Juniper Networks - How is the virtual MAC address derived for reth interfaces on J-Series and SRX?
If you want to know which interface to use for the fabric port, read this page , which also helpfully tells you what the FPC port will change to. Check out this slice of config. For example, you can give them IP addresses:. Basically you can do anything you like to a reth interface. Apart from marry it. Reth interfaces are not to be married. Adding physical interfaces into a virtual reth interface is super easy. Notice that on the Secondary device, the name of the interface has changed from ge-0 to ge You can even do automatic aggregated ethernet what Cisco calls Etherchannel by just assigning multiple physical interfaces into a reth interface.
Which is pretty cool, if you ask me! If you want more reths in the future, just change the reth-count. Wow, imagine saying that sentence to your Nan. You actually assign the priority to the redundancy-group, which is how you can do the load-balancing we mentioned above: We also add in some sweet sweet preempt, so that if the node1 does have to take over as Primary, node0 will take it back when it comes back online.
If one firewall dies, the other will take over.
Two Pairs of SRX Clusters on MAC Address Conflicts !
Of course, we also want the Secondary to become Primary if even one interface goes down. When the weight value reaches 0, the failover kicks in. For example, if you want the failover to kick in if even one interface goes down, do it like this:. Alternatively, maybe you want the Secondary to kick in only if two interfaces go down. When the first interface goes down, the weight value of redundancy group one will go down to minus You can even monitor the reth interface.
A reth interface goes down when all the physical interfaces attached to the reth go down. Do a show chassis cluster status to check that your firewalls are up and working as expected:. This command shows us which interfaces are up, and by how much the weight will drop if they go down:.
It gives a full config, and a few different topologies. Have you ever deployed Chassis Cluster? Did you find it easy to difficult?
Leave a comment down below! And if you found this post helpful, please do share it around on the social media of your choice: Bebo, Friends Reunited, and so on. Who knows: How do you configure the fabric ports on an SRX? As an extension to 1 — are you planning on doing another blog post for L2 switching in a SRX cluster?
Hi there Clay! Thanks for the kind words. Ooh good idea on the L2 switching. Regarding the interface numbering for different SRX models: Because Junos allows you to configure non-reth interfaces eg: This is why each port gets a unique identifier.
The numbering mechanism is just a continuation of the FPC numbering that each box supports — eg: Cheers Ben! Thanks for the kind words, and for that clarification. I just read your quick article on SRX clustering which is very good. I had a quick question related to SRX clustering, that I have been wondering about for several months, but have been unable to get a direct answer for. I am curious what others in the industry are doing?