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All configuration is done via Juniper Mist. In my Juniper EX4300-MP48 I created an interface IRB.30 with address 192.168.31.200

irb {
    unit 30 {
        description it;
        family inet {
            address 192.169.31.200/24;
        }
    }
}

and I added VLAN 30:

it {
    vlan-id 30;
    l3-interface irb.30;
}

but I cannot ping this address, not even from the switch itself. I ping with ping 192.168.31.200 and get this result:

PING 192.168.31.200 (192.168.31.200): 56 data bytes
^C
--- 192.168.31.200 ping statistics ---
70 packets transmitted, 0 packets received, 100% packet loss

So it seems that the VLAN is not working correctly or that the interface is down, so I use show vlans and get:

default-switch          it                    30
                                                           ge-0/0/0.0*
                                                           ge-0/0/10.0
                                                           ge-0/0/11.0
                                                           ge-0/0/12.0
                                                           ge-0/0/13.0
                                                           ge-0/0/14.0
                                                           ge-0/0/15.0
                                                           ge-0/0/4.0
                                                           ge-0/0/5.0
                                                           ge-0/0/6.0
                                                           ge-0/0/7.0
                                                           ge-0/0/8.0
                                                           ge-0/0/9.0

Here you can also see that the interface ge-0/0/0* has the * because that interface is part of a trunk. This is the Uplink interface So I run the command show interfaces irb.30 terse and get:

Interface               Admin Link Proto    Local                 Remote
irb.30                  up    up   inet     192.169.31.200/24

which clearly states that the interface is up, so I conclude that the issue is with the actual physical interface and therefore run the command show interfaces ge-0/0/0 terse which gives me the same result:

Interface               Admin Link Proto    Local                 Remote
ge-0/0/0                up    up
ge-0/0/0.0              up    up   eth-switch

So guys and gals... Please help an actual IT idiot :) I don't know where to go next or if I missed something in the initial setup.


EDIT 1

It was suggested i ping the arp cache, so I ran the command show arp which gives me

MAC Address       Address         Name                      Interface               Flags
94:ff:3c:6a:6d:93 192.168.31.1    192.168.31.1              vme.0                   none
04:5c:6c:44:87:31 192.168.31.13   192.168.31.13             vme.0                   none
b8:c2:53:e7:3c:2d 192.168.31.14   192.168.31.14             vme.0                   none
98:f2:b3:45:d1:00 192.168.31.20   192.168.31.20             vme.0                   none
00:15:65:c5:7b:93 192.168.31.106  192.168.31.106            vme.0                   none
10:c3:7b:6e:97:bc 192.168.31.122  192.168.31.122            vme.0                   none
Total entries: 6

I pinged all the various addresses and surely they responded, but I think it might be an issue that the .200 address is not present. But I'll have to figure that out somehow.

1
  • Have you checked the pinging machine's ARP cache, whether the MAC got resolved?
    – Zac67
    Jan 11, 2023 at 8:55

1 Answer 1

5

You have put the wrong ip address in the config. You have put an 9 instead of an 8.

address 192.169.31.200/24;

Should be

address 192.168.31.200/24;
1
  • It's always the little things. Mar 6, 2023 at 15:24

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