On 12/26/24 8:24 AM, Saku Ytti wrote:
On Thu, 26 Dec 2024 at 05:55, Bryan Fields <Bryan@bryanfields.net> wrote:
vlan { unit 405 { family iso { # holy shit this is important. CISCO and Juniper will not talk unless the MTU is set mtu 1492; } } } This is almost certainly the wrong solution to a real problem. Real problem being, you have MTU mismatch, and the wrong solution is you solve it for one ifa. You almost certainly want the MTU to be fixed in ifl or maybe even ifd.
I believe it was that one side was vlan tagged and the other wasn't or something to the effect of how the ISO MTU was calculated in the classic-IOS version vs. Junos. As this was for less than a carrier grade setup (tactical deployment during an hurricane) I didn't have time to get deep into it. A 3945e isn't exactly current anyway. I think the other juniper involved was a 4500, so kind of in the same age as the cisco. -- Bryan Fields 727-409-1194 - Voice http://bryanfields.net