Switching

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  Weird behavior with igmp-snooping
  • signal15

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  I have a surveillance camera that floods the network with RTP packets destined to a multicast address.  It was flooding the whole local LAN, so I enabled IGMP snooping globally.  This stopped the flooding, and traffic would only be sent to hosts that requested it.  However, I noticed that on some ports, I was seeing unicast traffic destined for other hosts, behavior more like a hub. Also, a continuous ping to any host on the network would have its latency increase with each ping until after about 15 pings or so I was getting 80-90% packet loss.  I disabled IGMP snooping and the multicast video stream on the camera, and things went back to normal. This is on an EX-4200. Did I forget to do something?
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  cr01a.nyc05 /kernel: peer_inputs: soreceive() error 0
  • pcclones

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  “cr01a.nyc05 /kernel: peer_inputs: soreceive() error 0”–Can any one explain me the the meaning for the error/log message ?
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  Juniper EX 4200 Switch mibs
  • ciscler

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  http://www.juniper.net/techpubs/software/junos/mibs.html#93
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  Problem with booting ex4200
  • dvalin

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  1. ALM Led - Wait until you can login before getting too concerned about this. 2. LCD Panel - Press one of the two buttons for a couple of seconds, this should bring the LCD display back. 3. Looks like the switch has been configured as part of a stack before. That explains some of the text you are seeing. What I would do. 1. Login as root - you already have - this will put you at a BSD terminal. 2. type cli and press enter - this will put you into the Switch CLI terminal, this is where you can start using ? 3. Reset the switch to factory default using the front panel or CLI If you login to the switch as root you will always go to the BSD CLI. Create another user called Admin (or whatever) that has a class (permission) or super-user. When you login as this use you will go straight into the switch CLI. Go to the Juniper website, under eduction there is free online training (basic) for the EX switches, go through this to get the basics. Paul McLean
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  Spanning tree problem and best practices
  • signal15

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  I have an interesting problem.  I have a client with an MX480 switch.  Their firewalls and servers are plugged into the same switch.  They want to implement an IDS that only is in line with the servers.  They had the same setup under Cisco and it worked fine. Two VLAN’s are created, vlan 101 and 102.  The L3 interface resides on vlan 101.  The outside of both IPS units plug into vlan 101, and the inside interfaces on the IPS plug into vlan 102.  The servers sit in vlan 102 and have a default gateway of the L3 interface on vlan 101.  With one IPS unit connected, everything works, but I’m having spanning tree problems when I plug in the second IPS. I’ve tried MSTP, both creating a single instance with both 101 and 102 in it.  And created separate instances with vlan 101 in the first one and vlan 102 in the second.  One end of each link goes into FWD mode, and the other end goes to BLK.  So no traffic can pass. I also tried VSTP.  I turned it on for both VLANs.  All ports go into FWD mode and cause a loop. After reading some documentation, it appears that BPDU’s may be hashed with the VLAN ID.  If this is the case, this will not work will it? What are my alternatives? Would this scenario work: Create VLAN 101 on the switch with an L3 interface Create a virtual switch with VLAN 101 that the servers reside on (so the BPDU’s are hashed with the same VLAN) Put the servers on VLAN 101 in the virtual switch Connect the IPS’s between ports on the main vlan 101, and ports on the virtual switch instance What’s the best way to configure MSTP?  Should I have separate instances for each VLAN?  Does it make sense to have one instance for odd VLAN’s and one for even VLAN’s for L2 load distribution to switches that are dual connected up to the MX480?
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  Virtual Chassis
  • leonards0581

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  Offical answer on both question is no. In a lab a saw 1 ping fail, so about a second. As for question two: you don’t have to preempt of course. I mean, you can choose to let device 2 play the boss.
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  Bootp helper stops working!
  • davido140

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  Hi All, Just had an odd issue with a clients VC of 8 EX 4200 switches, They have a dedicated workstation/client VLAN with a bootp helper configured to send dhcp requests into the server VLAN to the relevant server. for no apparent reason it just stopped working, it was still in the config file, and deleting it and recreating the exact same config made it start working again! Very frustrating as issues like this are damn near impossible to recreate or diagnose a root cause! Just wondered if anyone else had seen the same? Cheers Dave
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  Edit multiple interfaces simultaneously?
  • ehelm

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  @ehelm: I’m not familiar with apply-groups. Do you have an example that would allow for the following configuration? [edit interfaces ge-0/0/10 unit 0 family ethernet-switching]        vlan {            members DATA-VLAN;        } [edit interfaces ge-0/0/11 unit 0 family ethernet-switching]        vlan {            members DATA-VLAN;        } [edit interfaces ge-0/0/12 unit 0 family ethernet-switching]        vlan {            members DATA-VLAN;        } [edit interfaces ge-1/0/10 unit 0 family ethernet-switching]        vlan {            members DATA-VLAN;        } [edit interfaces ge-1/0/11 unit 0 family ethernet-switching]        vlan {            members DATA-VLAN;        } [edit interfaces ge-1/0/12 unit 0 family ethernet-switching]        vlan {            members DATA-VLAN;        } Why not do something like: vlans {   DATA-VLAN {     vlan-id 1234;     interface {       ge-0/0/10.0;       ge-0/0/11.0;       ge-0/0/12.0;       ge-1/0/10.0;       ge-1/0/11.0;       ge-1/0/12.0;     }   } } While int ranges can be used for other things, in your use case, this is a simple way to overcome that, until the functionality gets added…
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  CoS on EX series
  • manjkins05

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  HI , its not exactly an error in junos . its actually the logic . CoS is applied only in the outgoing traffic . you will mention the priority for the data that goes out of the port - Egress. Ingress is for the incoming traffic. CoS is not applied there . In this place you will have options for Ingess , Egress and Both. you can find “Egress” and “both” will display the same output. Hope this info helps you
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  Defining a new class for la user
  • joseph.sathish

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  hi i need to give a user specific permission . permission to use only few commands. how can i create a new class and give permissions. i am using Ex3200 and EX4200 . i was able to creae a new class for the user but not able to define it . please help me
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  Current Switch Processing and Throughput
  • ns

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  What is the command to see current throughput and utilized overall bandwidth of backplane and processing of EX 3200, Ex4200 switch and virtual chassis?
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  Update Junos Sofware
  • ns

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  What is the procedure to update Junos software on Ex switches form older to latest version, and what are the possible and secure way to do the updation ?
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  EX switch , does it have FX interface?
  • jacquelinehoe

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  TKs i just dropped you a ptv message, indicating the scenario of the setup
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  Virtual routers
  juniper junos switch virtual routers • • signal15

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  But a Light version to split up routing tables is supported! I forgot how this protocol is called, will look it up later.
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  How to tell which physical interface an IP address is connected to?
  • amouawad

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  Champion! Cheers screenie, works like a treat!
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  VRRP in ex3200 (successful)
  • fzhongjie

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  in attachment… enjoy sharing… ex3200-A.conf.txt ex3200-B.conf.txt