Transparent mode with L3Out: In this design, the service graph connects to the outside network through routing provided by the Cisco ACI fabric. With a function profile, you can create a collection of L4-L7 configuration parameters that you can use when you apply a service graph template. You may want to do this not because you want the bridge domain to be the default gateway, but because the mapping database needs to learn the IP addresses of the servers. Mandatory: If this option is set to true, the configuration item is mandatory. The service graph introduces multiple operational models for deploying L4-L7 services. Part of the L3Out configuration also involves defining an external network (also known as an external EPG) for the purpose of access list filtering. Bridge Domain 1 has an EPG to which the router and the firewall outside interface connect. Device Package Connectivity Information for the device cluster (vnsLDevViP) and devices (CDev) -Management IP, Credentials, In-band connectivity information) Please note that APIC still needs to know the topology information (LIF, CIF) for the device cluster and devices. Here you should configure externalIf and internalIf. L3Out connections are configured using the External Routed Networks option on the Networking menu for a tenant. 34, Routed Mode with L3Out Routing to the L4-L7 Device. Assume that you defined three contracts as in the following XML script: . If you are using a physical ASA, you likely will want to use a vPC to connect it to Cisco ACI. If it does change the MAC address, the Gratuitous ARP (GARP) traffic generated by the L4-L7 device must reach the ARP cache of the adjacent devices. Once the device is created, make sure that the device state is "Stable". The example in Figure 74 has three EPGs, two service graphs, and one concrete virtual service device. Therefore, you need to configure static or dynamic routing on the L3Out interface with the L4-L7 device. The bridge domain doesnt need to be configured for routing. The APIC needs to communicate with the primary switch to push the configuration to the ASA devices in the cluster. A function profile can be referenced from the user tenants in the location at which the function profile is defined. This approach is preferred because the fabric can route the traffic to the L3Out connection that has reachability to the external prefix without the need to perform bridging on an outside bridge domain. Deploy the Firewall to Secure East-West Traffic in Network Policy Mode. Each virtual context has a different configuration space, a different management IP address, different credentials, etc. A service graph is an order set of Layer 4 to Layer 7 devices between two endpoint groups. Subnet check is enabled, but the L4-L7 device uses NAT: If subnet check is enabled on BD1, the VM7 and VM8 IP addresses are not learned in BD1 (which is desirable). Virtual machines are on BD1 and BD2. For the physical domain in managed mode, use dynamic allocation mode for the VLAN range for the L4-L7 device (Figure 47). Capability for Cisco ACI to age the individual IP addresses: If Cisco ACI learns multiple IP addresses for the same MAC address as in the case of BD1, they are considered to refer to the same endpoint. However, you need to use the Single Node mode, because from the perspective of Cisco ACI, the cluster is one big logical device. To set up ASA clustering, you need separate port channels for the cluster control plane in addition to the spanned EtherChannel for cluster data plane (Figure 65). Figure 17 shows why data-plane learning must be disabled for the L4-L7 bridge domain. PBR requires a service graph, and the PBR node must be in go-to mode. This section completes the previous section with information specific to ASA. Cisco ACI Service Graph Contract (Device Package "Managed Mode") 2 Device Package"Unmanaged Mode" In this case, the failover configuration is in the admin context, which you dont need to configure multiple times for each virtual context, so you can set up failover configuration manually, without using APIC. You may need to enable routing on a bridge domain for two main reasons: Because you want Cisco ACI to route traffic, Because you want the mapping database to hold the IP address information of the endpoints for features such as dynamic endpoint attach or for troubleshooting purposes. The Cisco Application Centric Infrastructure ( ACI) treats services as an integral part of an application. - drag and drop the created devices to the template pane". It avoids to need to split Layer 2 domains (bridge domains) to insert, for instance, a firewall in the path. With hardware proxy and no ARP flooding, GARP traffic for firewall or load-balancer failover is not flooded. The VRF instance of the tenant is associated with the internal bridge domain just for consistency with the Cisco ACI object model. In the second case, you should use network policy mode or service manager mode. You thus need a service bridge domain, and the connectors must be configured for unicast routing. These interfaces are for failover communication only and are commonly used as individual interfaces. For a physical ASA device, you typically use multicontext mode. Clustering configuration is not supported during L4-L7 device creation on the APIC using a device package. - Select the Firewall mode " Routed ". The bridge domains used to connect the L4-L7 device are configured differently from the others because they need to have data-plane learning disabled and Gratuitous ARP (GARP) detection enabled. Static and dynamic routing both work on the L3Out SVI with vPC. The question is whether the same VRF instance can be used for multiple bridge domains, or whether each bridge domain should use a different VRF instance, as illustrated in Figure 22. This configuration also tells Cisco ACI where to deploy the shadow EPG. This setup should work for most deployments. You can also configure a port channel (Figure 57). In transparent mode, the L4-L7 device is deployed in pass-through (gothrough) mode. Cisco ACI - Service Graph Technology Tauseef N Khan Chief Technology Officer / Chief Strategy Officer / Co-founder - Rawasi Systems Published Aug 23, 2021 + Follow CiscoApplication Centric. The example in Figure 14 shows where Cisco ACI performs Layer 2 forwarding and where it performs Layer 3 forwarding. In Cisco ACI, this mode is called go-to mode. Certain device packages make only network configurations available through the APIC, leaving L4-L7 configurations to be managed directly on the device. In the Work pane, double-click the tenant's name. The default configuration, which works for most deployments, sets the parameters as follows: No routing (except if this bridge domain needs to be the default gateway for the servers or for the L4-L7 device), No subnet (except if this bridge domain needs to be the default gateway for the servers or for the L4-L7 device). 20152Service Graph F5 BIG-IP . When you define a graph template, you define the device type or the sequence of devices that should be placed between the consumer and the provider EPGs. Note: First generation Cisco ACI leaf switches are the Cisco Nexus 9332PQ, 9372PX-E, 9372TX-E, 9372PX, 9372TX, 9396PX, 9396TX, 93120TX, and Cisco Nexus 93128TX Switches. Cisco ACI creates EPGs to which the L4-L7 device connects, and it creates contracts to enable communication to and from the L4-L7 device (Figure 5). Figure 43 shows the same topology in Cisco ACI. It allows you to filter traffic between security zones in the same Layer 2 domain (bridge domain). With the other service graph deployment modes, the service graph doesn't steer traffic to the L4-L7 device, but it creates contracts to prevent the traffic from going directly from one EPG to the other. If you deploy the graph with service graph redirect, you need to define one or two bridge domains to which the L4-L7 device connects. When you successfully complete the configuration, you can see failover configuration on both ASA devices. View with Adobe Reader on a variety of devices. You can tune the bridge domain to reduce the amount of flooding in the domain. The configuration consists of multiple bridge domains and EPGs. The capability to disable ARP flooding depends on the configuration of hardware proxy and IP routing as follows: If hardware proxy is turned off, then ARP flooding is on and cannot be turned off. You must use a separate dedicated interface for the failover link. The subnet IP address on BD2 will not be used by the servers as their default gateway; hence, the part of the VRF instance associated with BD2 is shown in gray. Introduced in 2.2, we are now able to utilize 'unmanaged' service graphing. ASA clustering also can be integrated with Cisco ACI. If hardware proxy is turned on and IP routing is turned on, then you can disable ARP flooding. The following list shows the configurations for an ASA deployed in transparent mode: Bridge domain outside or client facing (consumer side). 29, Deploying the Graph Template on Multiple EPG Pairs. In this video, I configure and deploy a Cisco ACI Service graph with Policy Based Redirect. Reference Architecture | Dynamic L4-L7 Service Insertion with Cisco ACI and A10 Thunder ADC Executive Summary Traditional data center infrastructures are inlexible, diicult to change and don't scale well, making it hard to meet today's demanding data center needs in a cost-efective manner. Otherwise, the APIC cant access the secondary ASA device (Figure 61). In summary, when using designs that require interconnection of multiple bridge domains with IP routing enabled, you should follow these guidelines: Enable Limit IP Learning to Subnet to avoid learning the endpoint IP addresses of other bridge domains. The outside bridge domain in this figure offers routing for the service appliance. You deploy one virtual IP address for each service graph instance (three virtual IP addresses total). , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , .
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