Hello!
Now we have cisco core network with MPLS MTU = 1526, for transit EoMPLS.
1518 - Ethernet + vlan .1q tag
8 - 2 MPLS Label
1518+8 = 1526
Example:
interface GigabitEthernet0/1.15
description PE1
encapsulation dot1Q 15
ip address 1.1.1.30 255.255.255.252
tag-switching mtu 1526
tag-switching ip
!
On Juniper box, MPLS mtu automatically recalculated from MTU physical
interface.
And now, to set up mpls mtu 1526 on Juniper box we have configuration:
>show configuration interfaces ge-0/1/4
description "link to cisco CORE";
vlan-tagging;
mtu 1556;
unit 15 {
description MSN-MFIST1-PE3;
vlan-id 12;
family inet {
mtu 1500;
address 1.1.1.29/30;
}
family mpls {
mtu 1526;
}
}
What correct physical MTU, MPLS MTU must setup on Juniper box for the
organization of a joint CISCO and JUNIPER MPLS network.
Igor.
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