Update concepts-isolation-domain.md

Author: sushantjrao

articles/operator-nexus/concepts-isolation-domain.md

@@ -15,6 +15,8 @@ An Isolation Domain resource enables the creation of layer-2 and layer-3 network
 
 -   **Layer-2 isolation domain** - provides layer-2 networking capabilities within and across the racks for workloads running on servers. Workloads can take advantage of the isolated layer-2 network to establish direct connectivity among themselves at layer 2 and above.
 
+- **L2 isolation domain with extended VLAN Support (L2VRF)** - Nexus provides a way to extend Layer 2 (L2) connectivity from the Customer Edge (CE) router to the Provider Edge (PE) router. This is particularly useful workloads that require Layer 2 reachability outside nexus instance  
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 -   **Layer-3 isolation domain with Internal Networks** - provides workloads the ability to connect across a layer 3 (IP) network.
 
 -   **Layer-3 isolation domain with External Network** - provides workloads the ability to connect across a layer 3 network, and provides connectivity to the operator's network outside of the Operator Nexus network fabric.
@@ -39,6 +41,16 @@ A layer 2 isolation domain provides L2 networking capabilities between workloads
 
 The NNF enables operators to provision and manage layer 2 isolation domains below resource level. Each layer-2 isolation domain has an associated VLAN ID. If a workload needs connectivity to multiple VLANs, multiple layer-2 isolation domains must be created. A separate NIC resource is required for each layer-2 domain that the workload connects to.
 
+L2 isolation domain with extended VLAN Support (L2VRF) 
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+The L2VRF feature in Nexus enhances the flexibility and scalability of network configurations, making it easier to manage complex enterprise use cases. 
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+- **Extended VLAN Support:** The Layer 2 Isolation Domain (ISD) ARM resource now supports a new read-write property called extendedVlan, which defaults to false. When this property is set, the CEs are configured to trunk through the VLAN ID of the L2 ISD to the PE.
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+- **Dynamic Configuration:** The extendedVlan property can be dynamically toggled, and changes apply at the point of the next fabric commit.
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+- **Traffic Agnosticism:** Nexus is agnostic to the traffic running over this network and does not run any hosts or services on it. Address management, security, and services (DNS, DHCP, NTP, etc.) are user responsibilities.
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 ## Layer 3 Isolation Domains
 
 A layer 3 isolation domain provides workloads with the ability to exchange layer-3 routing information through the Operator Nexus network fabric and with external networks.