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doush
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Straight Forward MTU question

Mon Oct 14, 2013 4:48 pm

Hello
I know this is asked before but I am confused.

See below network :

|Router A| ---VPLS--- |RouterB| --ethernet-- <PPPoE Clients>

PPPoE s has to be terminated on Router A

Please tell me the following minimum values to avoid packet fragmentation + maximum VPLS performance.

1) Router A MPLS interface MTUs
/mpls interface> 
2) Router A VPLS interface MTU
/interface vpls> set advertised-l2mtu= ??
3) Max MRU and MAX MTU values for PPPoE Server
 2   service-name="service3" interface=vpls1 max-mtu=?? max-mru=?? 
     mrru=disabled authentication=pap,chap,mschap1,mschap2 keepalive-timeout=10 
     one-session-per-host=no max-sessions=0 default-profile=profile1 
I appreciate any answers.
 
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Bernardo
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Re: Straight Forward MTU question

Tue Oct 15, 2013 12:15 am

Hi,

1) 1526
2) 1500
3) 1492/1492

This is how it works for me.

saludos
Bernardo
 
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Re: Straight Forward MTU question

Tue Oct 15, 2013 1:54 am

This actually depends on your hardware, and max l2mtu.
 
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StubArea51
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Re: Straight Forward MTU question

Tue Oct 15, 2013 11:52 am

As far as MPLS mtu goes, here are the numbers you need for 1500 bytes frames.

1526 - To run untagged VPLS
1530 - To run tagged VPLS

As far as PPPoE, it requires 8 bytes of overhead for the PPP portion.

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