Ethernet Switching
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Ethernet Switching

Parth-mtu-discovery

‎09-02-2019 06:53 PM

Hi,

There is  various mtu configurations(inlc jumbo traffic) for a number of interfaces on the ex switch. But there is also the following statement on the same box...

                         set system internet-options path-mtu-discovery

If junos enables us to configure mtu manually for a number of interfaces, why should this statement be on the same box? Does it make sense?

 

 

Thanks

A.

1 REPLY 1
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Ethernet Switching

Re: Parth-mtu-discovery

‎09-02-2019 09:08 PM

Hello,

 


@Arix wrote:

 

                         set system internet-options path-mtu-discovery

 

 


 

This is for locally-originated traffic only (control and management protocols). 

You must not block ICMP type 3 code 4 in Your whole network for MTU discovery to work as per RFC 1191.

HTH

Thx

Alex

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