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Symmetric and asymmetric are the two operation models of IRB. In a real-world scenario, we're most likely to encounter a situation where some devices are configured with one IRB mode while others are configured with another within the same EVPN domain. This situation requires the two different IRB modes to interoperate with each other as per draft-ietf-bess-evpn-modes-interop. |
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In our test, the Arista leaf was configured with asymmetric IRB, while the Cisco leaf was configured with inter-op (hybrid) IRB mode. Then, we sent bidirectional unicast traffic, both inter- and intra-subnet, using Keysight IxNetwork between two VLAN-based IRB interfaces of these three symmetric and asymmetric PEs. There was no packet loss, confirming that bridging and routing functioned as expected. And we verified on the control plane that asymmetric PE had only one route target, whereas symmetric PE had two. It means that both the control plane and the data plane worked properly in this interoperability scenario. |
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[[~[~[Figure 47: EVPN Interoperability between Symmetric and Asymmetric VLAN-Based IRB~>~>image:486469475715776513_VXLAN-1.74.png~|~|alt="Figure 47" width="550"~]~]>>attach:486469475715776513_VXLAN-1.74.png||target="_blank"]] |
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|[[< Previous>>doc:Dual-Stack symmetric Integrated Routing and Bridging (IRB) VLAN-based Interface]]|[[Next ~>>>doc:Optimized Inter-Subnet Multicast (OISM) with EVPN to EVPN Gateway (EEG)]] |
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