Switch Virtual Interface
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- Gilbert Stafford
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1 This chapter contains the following sections: SVI External Encapsulation Scope, page 1 SVI Auto State, page 6 SVI External Encapsulation Scope About SVI External Encapsulation Scope In the context of a Layer 3 Out configuration, a switch virtual interfaces (SVI), is configured to provide connectivity between the ACI leaf switch and a router. By default, when a single Layer 3 Out is configured with SVI interfaces, the VLAN encapsulation spans multiple nodes within the fabric. This happens because the ACI fabric configures the same bridge domain (VXLAN VNI) across all the nodes in the fabric where the Layer 3 Out SVI is deployed as long as all SVI interfaces use the same external encapsulation (SVI) as shown in the figure. 1
2 About SVI External Encapsulation Scope However, when different Layer 3 Outs are deployed, the ACI fabric uses different bridge domains even if they use the same external encapsulation (SVI) as shown in the figure: Figure 1: Local Scope Encapsulation and One Layer 3 Out Figure 2: Local Scope Encapsulation and Two Layer 3 Outs Starting with Cisco APIC release 2.3, it is now possible to choose the behavior when deploying two (or more) Layer 3 Outs using the same external encapsulation (SVI). The encapsulation scope can now be configured as Local or VRF: Local scope (default): The example behavior is displayed in the figure titled Local Scope Encapsulation and Two Layer 3 Outs. 2
3 Encapsulation Scope Syntax VRF scope: The ACI fabric configures the same bridge domain (VXLAN VNI) across all the nodes and Layer 3 Out where the same external encapsulation (SVI) is deployed. See the example in the figure titled VRF Scope Encapsulation and Two Layer 3 Outs. Figure 3: VRF Scope Encapsulation and Two Layer 3 Outs Encapsulation Scope Syntax The options for configuring the scope of the encapsulation used for the Layer 3 Out profile are as follows: Ctx The same external SVI in all Layer 3 Outs in the same VRF for a given VLAN encapsulation. This is a global value. Local A unique external SVI per Layer 3 Out. This is the default value. The mapping among the CLI, API, and GUI syntax is as follows: Table 1: Encapsulation Scope Syntax CLI l3out vrf API local ctx GUI Local VRF Note The CLI commands to configure encapsulation scope are only supported when the VRF is configured through a named Layer 3 Out configuration. 3
4 Guidelines for SVI External Encapsulation Scope Guidelines for SVI External Encapsulation Scope To use SVI external encapsulation scope, follow these guidelines: If deploying the Layer 3 Outs on the same node, the OSPF areas in both the Layer 3 Outs must be different. If deploying the Layer 3 Outs on the same node, the BGP peer configured on both the Layer 3 Outs must be different. Configuring SVI External Encapsulation Scope Using the Advanced GUI Before You Begin The tenant and VRF configured. A Layer 3 Out is configured and a logical node profile under the Layer 3 Out is configured. Step 1 Step 2 Step 3 On the menu bar, click > Tenants > Tenant_name. In the Navigation pane, click Networking > External Routed Networks > External Routed Network_name > Logical Node Profiles > Logical Interface Profile. In the Navigation pane, right-click Logical Interface Profile, and click Create Interface Profile. In the Create Interface Profile dialog box, perform the following actions: a) In the Step 1 Identity screen, in the Name field, enter a name for the interface profile. b) In the remaining fields, choose the desired options, and click Next. c) In the Step 2 Protocol Profiles screen, choose the desired protocol profile details, and click Next. d) In the Step 3 Interfaces screen, click the SVI tab, and click the + icon to open the Select SVI dialog box. e) In the Specify Interface area, choose the desired values for the various fields. f) In the Encap Scope field, choose the desired encapsulation scope value. Click OK. The default value is Local. The SVI External encapsulation scope is configured in the specified interface. Configuring SVI Interface Encapsulation Scope Using NX-OS Style CLI The following example displaying steps for an SVI interface encapsulation scope setting is through a named Layer 3 Out configuration. 4
5 Configuring SVI Interface Encapsulation Scope Using the REST API Step 1 Command or Action Enter the configure mode. Purpose Enters the configuration mode. Step 2 apic1# configure Enter the switch mode. Enters the switch mode. Step 3 Step 4 apic1(config)# leaf 104 Create the VLAN interface. apic1(config-leaf)# interface vlan 2001 Specify the encapsulation scope. Creates the VLAN interface. The VLAN range is Specifies the encapsulation scope. Step 5 apic1(config-leaf-if)# encap scope vrf context Exit the interface mode. Exits the interface mode. apic1(config-leaf-if)# exit Configuring SVI Interface Encapsulation Scope Using the REST API Before You Begin The interface selector is configured. Configure the SVI interface encapsulation scope. <?xml version="1.0" encoding="utf-8"?> <!-- /api/node/mo/.xml --> <poluni> <fvtenant name="coke"> <l3extout descr="" dn="uni/tn-coke/out-l3out1" enforcertctrl="export" name="l3out1" namealias="" ownerkey="" ownertag="" targetdscp="unspecified"> <l3extrsl3domatt tdn="uni/l3dom-dom1"/> <l3extrsectx tnfvctxname="vrf0"/> <l3extlnodep configissues="" descr="" name=" ui_node_101" namealias="" ownerkey="" ownertag="" tag="yellow-green" targetdscp="unspecified"> <l3extrsnodel3outatt rtrid=" " rtridloopback="no" tdn="topology/pod-1/node-101"/> 5
6 SVI Auto State <l3extlifp descr="" name="int1_11" namealias="" ownerkey="" ownertag="" tag="yellow-green"> <l3extrspathl3outatt addr=" /24" descr="" encap="vlan-2001" encapscope="ctx" ifinstt="ext-svi" lladdr=" " mac="00:22:bd:f8:19:ff" mode="regular" mtu="inherit" tdn="topology/pod-1/paths-101/pathep-[eth1/5]" targetdscp="unspecified"/> <l3extrsndifpol tnndifpolname=""/> <l3extrsingressqosdpppol tnqosdpppolname=""/> <l3extrsegressqosdpppol tnqosdpppolname=""/> </l3extlifp> </l3extlnodep> <l3extinstp descr="" matcht="atleastone" name="epg1" namealias="" prefgrmemb="exclude" prio="unspecified" targetdscp="unspecified"> <l3extsubnet aggregate="" descr="" ip=" /24" name="" namealias="" scope="import-security"/> <fvrscustqospol tnqoscustompolname=""/> </l3extinstp> </l3extout> </fvtenant> </poluni> SVI Auto State About SVI Auto State Note This feature is available in the APIC Release 2.2(3x) release and going forward with APIC Release 3.1(1). It is not supported in APIC Release 3.0(x). The (SVI) represents a logical interface between the bridging function and the routing function of a VLAN in the device. SVI can have members that are physical ports, direct port channels, or virtual port channels. The SVI logical interface is associated with VLANs, and the VLANs have port membership. The SVI state does not depend on the members. The default auto state behavior for SVI in Cisco APIC is that it remains in the up state when the auto state value is disabled. This means that the SVI remains active even if no interfaces are operational in the corresponding VLAN/s. If the SVI auto state value is changed to enabled, then it depends on the port members in the associated VLANs. When a VLAN interface has multiple ports in the VLAN, the SVI goes to the down state when all the ports in the VLAN go down. Table 2: SVI Auto State SVI Auto State Disabled Enabled Description of SVI State SVI remains in the up state even if no interfaces are operational in the corresponding VLAN/s. Disabled is the default SVI auto state value. SVI depends on the port members in the associated VLANs. When a VLAN interface contains multiple ports, the SVI goes into the down state when all the ports in the VLAN go down. 6
7 Guidelines and Limitations for SVI Auto State Behavior Guidelines and Limitations for SVI Auto State Behavior Read the following guidelines: When you enable or disable the auto state behavior for SVI, you configure the auto state behavior per SVI. There is no global command. Configuring SVI Auto State Using the Advanced GUI Before You Begin The tenant and VRF configured. A Layer 3 Out is configured and a logical node profile and a logical interface profile under the Layer 3 Out is configured. Step 1 Step 2 Step 3 Step 4 On the menu bar, click > Tenants > Tenant_name. In the Navigation pane, click Networking > External Routed Networks > External Routed Network_name > Logical Node Profiles > Logical Interface Profile. In the Navigation pane, expand Logical Interface Profile, and click the appropriate logical interface profile. In the Work pane, click the + sign to display the SVI dialog box. To add an additional SVI, in the SVI dialog box, perform the following actions: a) In the Path Type field, choose the appropriate path type. b) In the Path field, from the drop-down list, choose the appropriate physical interface. c) In the Encap field, choose the appropriate values. d) In the Auto State field, choose the SVI in the Work pane, to view/change the Auto State value. The default value is Disabled. Note To verify or change the Auto State value for an existing SVI, choose the appropriate SVI and verify or change the value. Configuring SVI Auto State Using NX-OS Style CLI Before You Begin The tenant and VRF configured. A Layer 3 Out is configured and a logical node profile and a logical interface profile under the Layer 3 Out is configured. 7
8 Configuring SVI Auto State Using the REST API Step 1 Command or Action Enter the configure mode. Purpose Enters the configuration mode. Step 2 apic1# configure Enter the switch mode. Enters the switch mode. Step 3 Step 4 Step 5 apic1(config)# leaf 104 Create the VLAN interface. apic1(config-leaf)# interface vlan 2001 Enable SVI auto state. apic1(config-leaf-if)# autostate Exit the interface mode. Creates the VLAN interface. The VLAN range is Enables SVI auto state. By default, the SVI auto state value is not enabled. Exits the interface mode. apic1(config-leaf-if)# exit Configuring SVI Auto State Using the REST API Before You Begin The tenant and VRF configured. A Layer 3 Out is configured and a logical node profile and a logical interface profile under the Layer 3 Out is configured. Enable the SVI auto state value. <fvtenant name="t1" > <l3extout name="out1"> <l3extlnodep name=" ui_node_101" > <l3extlifp descr="" name=" ui_eth1_10_vlan_99_af_ipv4" > <l3extrspathl3outatt addr=" /24" autostate="enabled" descr="" encap="vlan-100" encapscope="local" ifinstt="ext-svi" lladdr="::" mac="00:22:bd:f8:19:ff" mode="regular" mtu="inherit" tdn="topology/pod-1/paths-101/pathep-[eth1/10]" targetdscp="unspecified" /> 8
9 Configuring SVI Auto State Using the REST API </l3extlifp> </l3extlnodep> </l3extout> </fvtenant> To disable the autostate, you must change the value to disabled in the above example. For example, autostate="disabled". 9
10 Configuring SVI Auto State Using the REST API 10
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