vdc vs vrf
Published by on November 13, 2020
In addition, VRF requires a forwarding table that designates the next hop for each data packet, a list of devices that may be called upon to forward the packet, and a set of rules and routing protocols that govern how the packet is forwarded. The installed software on the chassis is applicable for all active VDCs. All rights reserved. Support for hardware partitioning is discussed later in this document. 1. When embarking on digital transformation initiatives, its important to factor in WAN design to avoid poor application performance and customer dissatisfaction. The virtualization aspect of the Cisco NX-OS Software platform has been extended to support the notion of virtual device contexts (VDCs). For us it is testing. In VDC mode, many benefits can be achieved such as per-VDC fault isolation, per-VDC administration, separation of data traffic, and enhanced security. In one VDC/VRF I only need 10 ports. (VPC Pair of 7710s version 8.4). Each of these user roles is discussed in more detail in the following sections. Cisco NX-OS is based on Cisco MDS 9000 SAN-OS and has been developed for data center deployments. This user type also cannot create or delete a VDC, including the VDC that it administers. So, for instance, a spanning tree recalculation that might be started in one VDC is not going to affect the spanning tree domains of other VDCs in the same physical chassis. Because traffic is automatically segregated, VRF also increases network security and can eliminate the need for encryption and authentication.
Per-VDC logging of messages via syslog is also another important characteristic of the VDC fault isolation capabilities. As new services are configured, the system manager will launch the appropriate process.
Creating a VDC is done from configuration mode using the vdc
The collection and export of flows is always done on a per-VDC basis.
Scaling Nexus 7000 Switch Resources Using Virtual Device Contexts, 3.1 Layer 2 Address Learning with Virtual Device Contexts, 3.2 Layer 3 Resources and Virtual Device Contexts, 4. In addition to interfaces, other physical resources can be allocated to an individual VDC, including IPv4 route memory, IPv6 route memory, port-channels, and SPAN sessions.
A VDC is a virtual device and offers much more than VRF and VLANs (such as separate VRFs, VLANs, data planes, administrative functionality, configuration). When in the default VDC, the administrator can move to any VDC that is shown in the preceding VDC list. A VRF can be used to virtualize the Layer 3 forwarding and routing tables. Ports 1 through 8 belong to VDC 5 while ports 41 through 48 belong to VDC 10. When multiple VDCs are created in a physical switch, inherently the architecture of the VDC provides a means to prevent failures within that VDC from affecting other VDCs. When this occurs, duplication of VRF names and VLAN IDs is possible.
Within the VDC, you can have multiple VRFs and VDCs. An EEM policy (applet) is configured within the context of a VDC. Configuration of a resource template is performed in configuration mode as shown in the following example. For example, switching to the engineering VDC is done as follows: Cisco Nexus Operating System (NX-OS) Software. VRF (Virtual Routing & Forwarding) is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time.Because the routing instances are independent, overlapping IP addresses can be used without conflicting with each other.
Successful long-term remote work needs unified communications. With this implementation of Layer 2 learning, the Cisco Nexus 7000 Series Switch offers a way to scale the use of the Layer 2 MAC address table more efficiently when VDCs are unique to line cards. An OSPF process crash is another example where the fault is isolated locally to that VDC. If the VDC role is for the core and aggregation use case the HA policy would be switchover. When the administrator switches from the default VDC to another VDC, the CLI prompt will change to reflect that the user has moved into a new VDC. Subsequent VDCs created will have a default value of bringdown assigned to them. For transparent backup purposes, merging templates with the configuration adds the benefit of being able to back up all configurations specific to a VDC by simply backing up the primary configuration. 2 technologies which have helped networking across various segments are VLAN and VDC. 2. Working under control of the infrastructure layer is a number of other important system processes, which also exist as a unique entity. This further extends the use of those resources well beyond the defined system limits noted here. Cisco Data Center Networking Demo Series - Unveiling Cisco N... decommissioning a single cisco switch Cisco catalyst 9300, Unlock the power of the new Cisco Intersight, Transforming Data Center management for a hybrid IT world. Unlike ISSU, each FHRP service is available on a per-VDC basis. Even though not all layers are virtualized, all of the major components have been built with the purpose to support the concept of VDCs.
When a new MAC address is learned by a line card, it will forward a copy of that MAC address to other line cards. The next step is to tie each interface to a VRF: interface FastEthernet0/0.1 encapsulation dot1Q 201 ip vrf forwarding POD1 ip address 192.168.1.1 255.255.255.0 Figure 2 depicts the major software elements that enable VDCs. An external connection needs to be made between ports of VDC to perform internal VDC (VDC to VDC) communication. This single device context has a number of layer 2 and 3 services running on top of the infrastructure and kernel components of the OS as shown in the following diagram. Address, VLAN, VRF, and vPC isolation; Each VDC appears as a unique device and allows for separate Roles-Based Access Control Management (RBAC) per VDC.
For example, there are 256 Cisco EtherChannel. At supervisor switchover, the data plane continues to use the Layer 2- and Layer 3-derived forwarding entries simply by maintaining the state written into the hardware. While VLAN is short for Virtual Local Area Network, VDC means Virtual device contexts.VLAN divides the network into separate logical areas at the Layer 2 level and each VLAN is considered an individual broadcast domain.
Some of these processes can have other threads spawned, resulting in as many as 250 processes actively running on the system at a time depending on the services configured.
The following section provides more detail on this topic. A supported configuration is to virtualize a physical interface and associate the resulting logical interfaces with different VRFs or VLANs. 2 ports on each chassis would be used but they would be on the same card (ex, VPC - card 7 ports 1,2,3,4 on both chassis). Each VDC also maintains an individual high-availability (HA) policy that defines the action that the system will take when a failure occurs within a VDC.
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