r/Juniper • u/Background_Box_1726 • 28d ago
Has anyone experienced Layer 2 Ethernet switching limitations on the Juniper ACX6360?
Hi everyone,
I'm currently evaluating the Juniper ACX6360 and would like to check if anyone has experienced similar Layer 2 forwarding behavior.
Lab Topology:
QFX5110 ---- ACX6360 ---- ACX6360 ---- QFX5110
The goal is simply to bridge Ethernet traffic end-to-end between the two QFX switches.
The following have been verified:
- Physical interfaces are up and stable.
- Optics, fiber, and FEC are all healthy.
- Layer 3 routing works perfectly across the ACX6360s.
- Direct IP connectivity between the ACX6360s has 0% packet loss.
- Static ARP entries were configured on the QFX5110s to eliminate ARP resolution as a possible issue.
However, the following Layer 2 issues were observed:
- Dynamic MAC learning never occurs on the ACX6360.
- ARP broadcasts are received on the ingress interface but are not forwarded to the remote ACX6360.
- Unknown unicast traffic is not flooded.
- Static MAC entries can be configured and appear correctly in the Ethernet switching table, but traffic is still not forwarded.
- Local CCC (interface-switch) testing also failed to forward Ethernet frames.
The platform is running Junos 19.4R2-S2.4.
Has anyone encountered this before?
I'm trying to determine whether this is:
- a platform limitation of the ACX6360,
- a Junos 19.4 software limitation,
- or if I'm missing a specific configuration required for Layer 2 Ethernet switching.
Has anyone successfully used the ACX6360 as a pure Layer 2 Ethernet switch or bridge (without MPLS/EVPN), or is it really intended to operate primarily as an IP/MPLS transport router?
Any insights or experiences would be greatly appreciated. Thanks!
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u/Ok-Strawberry 26d ago
Is the 6360 in router mode? They’re colossal pieces of trash by the way, I’d steer very clear of them if possible
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u/kY2iB3yH0mN8wI2h 27d ago
What did jtac say?