We do the same here. 1600 on cust ports, 9k on core network ports. Shouldn't have to revisit them too often.
David On 03/03/2008, Erdem Sener <[EMAIL PROTECTED]> wrote: > FWIW, I'd configure all ethernets with MTU 1600 as a policy and never > think about MTU again. > (including any switches in the middle as said) > > Erdem > > On Mon, Mar 3, 2008 at 5:11 PM, Mark Tinka <[EMAIL PROTECTED]> wrote: > > On Monday 03 March 2008, Ying Zhang wrote: > > > > > we are having a wired MPLS problem. Here is how the > > > network looks like: > > > > > > end users ---- M7i ---- M120 ----ISP > > > > > > The mpls lsp is between M7i and M120. The problem is the > > > end users have problems accessing certain websites, very > > > slow or not accessible, some websites no problem at all. > > > With MPLS disabled (OSPF only), the problem is gone. I > > > think it is a MTU issue, tried to lower MTU on M7i user > > > side, didn't fix it. Might also try to increase MTU on > > > MPLS interfaces, but not sure. Any thoughts? Very > > > appreciated. > > > > Yes, definitely sounds like an MTU issue. > > > > For a single label (MPLS switching only, no VPN's or > > anything kinky like that), you need at least 1504 bytes on > > Ethernet. > > > > With L3VPN's, you need 2 labels (one for the VPN and another > > for MPLS switching). This brings you to 1508 bytes. > > > > To this end, I've normally configured 1524 bytes at a bare > > minimum on the interface. Note, however, that both the > > router port and adjacent Ethernet switch need to be > > configured for higher MTU's, otherwise you'll experience > > the symptoms you describe above. > > > > Cheers, > > > > Mark. > > > > _______________________________________________ > > juniper-nsp mailing list juniper-nsp@puck.nether.net > > https://puck.nether.net/mailman/listinfo/juniper-nsp > > > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp