Switching

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  • 1.  the maximum entry for dhcp snooping binding table

    Posted 03-16-2011 06:11

    Hi everybody.

     

    I'm trying to find out the maximum entry for dhcp snooping binding table on EX4200 and EX4500 Does anybody have any information on this?

     

    Thanks!



  • 2.  RE: the maximum entry for dhcp snooping binding table

    Posted 03-16-2011 18:18

    The EX4200 supports up 18,000 entries in the table on the EX4200. Not sure about 4500 yet.



  • 3.  RE: the maximum entry for dhcp snooping binding table

    Posted 03-16-2011 18:34

    Thank you for the information!

    By the way, where did you get the information?
    Is it on any Juniper guide? I have already checked the KB and software guide but I didn't find that answer.

    Did you actually set 18000 entries on the device?

     

    regards



  • 4.  RE: the maximum entry for dhcp snooping binding table

    Posted 03-18-2011 10:11

    I received the information from Juniper internal resources to support an RFP I was answering for a customer.



  • 5.  RE: the maximum entry for dhcp snooping binding table
    Best Answer

    Posted 03-31-2011 01:48

    Thank you for the information!

     

    I got another kind of information.

    The number is 16000 on EX4200.it’s same as arp entry number.

     

    Anyway,

    Thanks. I really appreciate it.



  • 6.  RE: the maximum entry for dhcp snooping binding table

    Posted 12-10-2013 04:18

    Hi.

     

    I have a topo like this.

    Client1--------------EX4200-01-------------EX4200-02--------------CLient2

    After deploying DHCP Snooping on two EX Switches, Client 1, and Client will receive IP from a Server connected to EX4200-01, and default-gateway of two clients is configured on EX4200-01. After they get IP already, I run the command

     

    show dhcp snooping binding on EX4200-01, I only see the IP of Client1, and if I run that command on EX4200-02, there's nothing.

     

    Anybody can help me to explain?



  • 7.  RE: the maximum entry for dhcp snooping binding table

    Posted 12-13-2013 11:03

    What about interface connecting two switches, is it access port and dhcp-trusted on both side, If dhcp-trusted only on switch 2 then switch2 client will get IP and also have dhcp snooping database entry. If switch 1 (running dhcp server) port connected to switch 2 is also dhcp-trusted then switch 1 one will not have dhcp snooping entry for devices connected to switch 2 , It is logical because if switch1 port connected to switch2 is dhcp-trusted then it will not perform arp inspection neither dhcp examine. On switch 2 just disconnect your client and run command after re-connecting client to switch2 (also make sure interface connected to client is not dhcp-trusted by default access mode interfaces are in dhcp untrusted mode). No arp inspection and DHCP snooping will be performed for dhcp-trusted interfaces

     

     

     

    Pleas mark this as accepted solution if it solves your problem

    Kudos a good way of appreciation

     

    Kashif Nawaz

    JNCIP-Sec , JNCIS-Ent, JNCIS-Sec, JNCIA-Junos