https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/auto-negotiation-edit-interfaces.html
NOTE: 1G optical transceivers do not support auto-negotiation on EX4100 1G/10G uplink module (PIC 1/PIC 2) and EX4400 1G/10G interface. 1G-T supports auto-negotiation on these ports. On Sun, Nov 10, 2024 at 1:16 PM Bernhard Schmidt via juniper-nsp < [email protected]> wrote: > Hey, > > maybe someone has a quick idea before I pester JTAC for weeks without > success. > > We are starting to migrate our campus network to Juniper EX4100/EX4400 > series and we have hit a blocker. We've now had several cases where we > could not get a working 1GE fiber connection when the Juniper side was > in a SFP+ slot > > First issue with a EX4100-F-12P with an original JNPR 1GE-LX optics in > ge-0/1/0, the other side being an unmanaged media converter. Running > 22.4R3.25 > > Second issue was a EX4400-48F with a third-party 1GE-SR optics in > ge-0/0/36+, the other side being a Huawei S5720 switch. Running > 23.4R1.9. > > In both cases the behaviour is the same > > - JNPR sees link-up, no incoming packets > - the other side sees the link as down, but has a decent Rx power > > We know of these 1GE fiber autoneg issues from our Arista core (where, > according to Arista, there is just no 25G chip available on the market > that can do 1GE with auto-neg), so we have to disable 1GE autonegotation > on the other side in the few cases this is happening. But this is > campus, so we don't have control over the other side, and it even > happened with unmanaged converters. > > I think it's the autoneg issue because when I add "undo negotiation auto" > on the Huawei side the link comes up there as well, and we can pass > traffic just fine. However, that's not an option in Campus, see above. > > Also, moving the link from port 36 (1G/10G) to port 35 (1G only) on the > EX4400-48F fixes the issue as well. > > I have tried (on the EX4100-F) > > set interfaces ge-0/1/0 ether-options auto-negotiation > > and optionally > > set interfaces ge-0/1/0 speed auto > > according to > > | Autonegotiation is enabled by default, and will autonegotiate the > | speed with the link partner. We recommend that you keep autonegotiation > | enabled for interfaces operating at 100M and 1G. By default, > | autonegotiation is disabled on 10-Gigabit fiber ports. > > | If for some reason you have disabled autonegotiation, you can enable it > | by issuing the set interfaces name ether-options auto-negotiate command. > > | To disable autonegotiation, issue the delete interfaces name > | ether-options auto-negotiate command. > > to no avail. > > Does anyone have any idea how I can beat the Juniper side into doing > autoneg on 1GE fiber? > > Bernhard > > _______________________________________________ > juniper-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/juniper-nsp > > _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
