I'm not really sure what your question is - Asymmetric does not use type 5, rather each VTEP must have each VNI configured locally. Symmetric uses type-5 where a transit VNI is used to interconnect VTEPs. Either way, you should be able to route/switch traffic in your scenario.
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DANIEL HEARTY
Principal Engineer
TELENT TECHNOLOGY SERVICES LIMITED
Southampton
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Original Message:
Sent: 05-16-2021 20:01
From: zee
Subject: Symmetric and asymmetric mode in VXLAN BGP EPN use case
Hi everybody,
I am trying to understand use cases for symmetric and asymmetric mode.
https://www.juniper.net/documentation/en_US/release-independent/solutions/information-products/pathway-pages/solutions/evpn-type5-configuring.pdf
From above link:
By contrast, "symmetric" mode performs an equal number of lookups-IP and MAC-on both the ingress and egress
NVEs. Symmetric mode is also called the VRF-to-VRF model.
Advantages of using EVPN Type 5 in DCI
When a single Layer 2 domain is not extended across multiple data center (DC) locations, the IP subnet belonging to this
Layer 2 domain is confined within a single DC. If all Layer 2 domains within each DC network satisfy this requirement,
there is no longer a need to advertise separate MAC+IP routes for each tenant between DCs, as host routes for the
tenants can be aggregated. Thus, the Layer 2 inter-DC connectivity issue can be simply transformed to an inter-DC Layer
3 IP prefix reachability issue. A unified EVPN control plane can be used to accomplish Layer 3 route advertisement
between multiple DC locations, avoiding the need for an additional L3 VPN protocol family.
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So we can only use asymmetric mode for inter VNI communication if VLANS are confined within Data center.
For example:
Above we have hosts in v10,v20 at both data center, in order to provide inter vni communication, we can use symmetric mode , we cannot use symmetric mode because V10,v20 need to be extended between two data centers?
Thanks and have a good day!!
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zee
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