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Virtual switch SRX300 and newer SRX

  • 1.  Virtual switch SRX300 and newer SRX

    Posted 11-11-2025 19:34

    I have had a little trouble with the routing instance of a virtual switch. The trouble is that it does something I've never seen my srx300 do. It gets stuck in dhcp apipa and is not accessible. I did not send it to rescue. I had to roll it back, which if I had chosen to do(rescue), is dangerous. But still perhaps it would be fine given a full reset. So a word to the wise. Make sure apipa is a policy before this. Does anyone actually have this working.

    Can someone explain if other parts can work in this statement? It seems skimpy. My symptoms are:

    1. Srx not accessible through web.

    2. DHCP only gives apipa addresses.

    3. Can only rollback history.

    As with the web accessibility the srx seems to choke inherently and this shows to be true with virtual switch. But other problems arise. Can anyone give any advice?

    srx300-c xfinity model

    does not have stp, mstp, etc.

    15.1X49-D60.7



        MyVRSwitch {

            instance-type virtual-switch;

            access {

                address-assignment {

                    neighbor-discovery-router-advertisement p4;

                    pool p1 {

                        family inet {

                            network 192.168.1.0/24;

                        }

                    }

                    pool p2 {

                        family inet6 {

                            prefix 2001:558::0/64;

                        }

                    }

                    pool p3 {

                        family inet6 {

                            prefix 2601:204::0/64;

                        }

                    }

                    pool p4 {

                        family inet6 {

                            prefix fe80::0/64;

                        }

                    }

                }

            }

            vrf-advertise-selective {

                family {

                    inet-mvpn;

                    inet6-mvpn;

                }

            }

            forwarding-options {

                load-balance {

                    per-prefix {

                        hash-seed 24051;

                    }

                }

            }

        }

    }



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------


  • 2.  RE: Virtual switch SRX300 and newer SRX

    Posted 11-12-2025 12:26

    With chopped configuration it is mysterious to find the part where dhcp server operates in terms in instances as the network layers operate not necessarily as switch or virtual switch when it comes to DHCP as well as Layer 3 related to web management and possibly others. Full configuration, sanitized of course, is always preferable.



    ------------------------------
    Nikolay Semov
    ------------------------------



  • 3.  RE: Virtual switch SRX300 and newer SRX

    Posted 12-07-2025 12:19

    I still have not tried to commit this again and im essentially at the same conclusion. I want to state that I think my locale is a major factor. My engineering station is also a culprit. It is 4 and 5 hops back. So maybe others don't notice this. I'm going to see if an uncommitted try will give high cpu results.

    I would like to know if anyone has this problem and how they can fix it?



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 4.  RE: Virtual switch SRX300 and newer SRX

    Posted 12-15-2025 18:39

    Reviving post!



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 5.  RE: Virtual switch SRX300 and newer SRX

    Posted 02-09-2026 18:51

    Reviving post again!



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 6.  RE: Virtual switch SRX300 and newer SRX

    Posted 02-10-2026 04:10

    I think I spotted the problem: "15.1X49-D60.7"

    You really need to upgrade! Troubleshooting 10 year old code isn't very useful. A USB format install is very much preferred with such old releases, otherwise you have 6-7 steps of upgrading ahead of you.

    -------------------------------------------



  • 7.  RE: Virtual switch SRX300 and newer SRX

    Posted 02-10-2026 15:22

    fb35523

    Upgrade was my first thought.

    This is the only thing that's never worked outright. All other things aside, this srx is a comcast unit. I'm so close to finishing my network. You know how when you are completing something and you say, "don't touch that". That's my case.

    So to all folks, if anything that can be added or changed, plz say so. Upgrade is an option, but im just so close to finishing. 

    Thx for the post fb.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 8.  RE: Virtual switch SRX300 and newer SRX

    Posted 03-17-2026 20:53

    I'm still wondering if anyone can help me compare. I haven't this code in my srx300. Who does? Reviving post.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 9.  RE: Virtual switch SRX300 and newer SRX

    Posted 04-07-2026 19:25

    Reviving post!



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 10.  RE: Virtual switch SRX300 and newer SRX

    Posted 15 days ago

    Reviving post!



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------



  • 11.  RE: Virtual switch SRX300 and newer SRX

    Posted 12 days ago

    Hi

    Since you have a moved interfaces to virtual switch they dissapear from your inet.0 table which would explain the APIPA addresses.

    Your config is missing layer 3 configs, so you need an IRB interface for this to act as gateway.

    add below

    set interfaces irb unit 1 family inet address 192.168.1.1/24

    then tell the switch to use the IRB

    set routing-instances MyVRSwitch bridge-domains default vlan-id 1
    set routing-instances MyVRSwitch bridge-domains default routing-interface irb.1

    then tell the pool which router to use

    set routing-instances MyVRSwitch access address-assignment pool p1 family inet dhcp-attributes router 192.168.1.1

    other things to check

    system services web-management

    ensure irb.1 is added to security zones

    -------------------------------------------



  • 12.  RE: Virtual switch SRX300 and newer SRX

    Posted 10 days ago

    I'll look at those statements and apply them to at least one of my srx's. The srx with vlan interface is where I have the virtual switch statements because that commits fine. That is my srx550. My srx300 has this virtual switch problem. It is my first opinion that it is an out of the box problem, however it is after adding configuration. I've never in all code adding have seen the srx300 do this. Requires rollback. Until I know of someone who can reproduce my problem with a fix I'll leave it out. My locale is most likely the factor. But I don't think it should do it at all. Thx for the replies.



    ------------------------------
    Adrian Aguinaga
    B.S.C.M. I.T.T. Tech
    (Construction Management)
    A.A.S. I.T.T. Tech
    (Drafting & Design)
    ------------------------------