Configuring VN-Segment
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- Brook Bryan
- 6 years ago
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1 This chapter contains the following sections: Information About VN-Segment, page 1 Guidelines and Limitations for VN-Segment, page 3 Enabling VN-Segment, page 3 for a VLAN, page 4 for VLAN in Configure Sync, page 5 in Transit Mode, page 5 in Non-Transit Mode, page 6 Disabling VN-Segment, page 6 Verifying VN-Segment Configuration, page 7 Information About VN-Segment The VN-Segment feature defines a new way to "tag" packets on the wire replacing the traditional 802.1Q VLAN tag. This feature uses a 24-bit tag also referred to as a Virtual Network Identifier (VNI). CE links (access and trunk) carry traditional VLAN tagged/untagged frames. These are the VN-Segment Edge ports. 1
2 Information About VN-Segment FabricPath links (switchport mode fabricpath) carry VN-Segment tagged frames for VLANs that have VNIs defined. These are the VN-Segment core ports. Figure 1: VN-Segment and FabricPath The previous figure shows a typical Cisco FabricPath network. Switches S1 and S2 are the spine switches. Switches S3 and S4 are the leaf switches and are connected to the spines over FabricPath interfaces. The VN-Segment feature is enabled on all leaf switches. Server A is connected to leaf switch S3 and server B is connected to leaf switch S4 through normal Layer 2 trunk/access ports. These interfaces are also referred to as the "VNSeg Edge" ports. The servers send and receive traditional.1q tagged or untagged frames. No new configurations are needed on the servers. The spines forward the VN-Segment tagged frames to the intended leafs. Assume that servers A and B need to be in the same Layer 2 flood domain. On the leaf switches, VLAN 333 is mapped to an available VN-Segment ID This VN-Segment ID identifies the VLAN 333 on the FabricPath network. Here is a typical packet flow: 1 A data packet from server A to server B tagged with VLAN 333 is received on the VNSEG port of S3. 2 S3 does the packet lookup and sends the packet on the FabricPath port towards the spine. The switch S3 uses the VN-Segment ID corresponding to the VLAN. 3 S1 and S2 performs FabricPath forwarding towards the intended leafs. 2
3 Guidelines and Limitations for VN-Segment 4 S4 receives the VN-Segment ID tagged packet and performs packet lookups. Once the packet destination port is identified as a VNSEG edge port, S4 uses the VLAN ID corresponding to the VN-Segment ID in the packet and sends the packet. Note If the VN-Segment ID to VLAN mapping does not exist, the packet is dropped. 5 Server B receives the.1q data packet from Server A. The same process is followed in the data packets from server B to server A. Guidelines and Limitations for VN-Segment Enabling VN-Segment VN-Segment has the following guidelines and limitations: The VN-Segment tag is added to traffic egressing FabricPath (FP) links only. Data forwarding semantics is the same as that of the VLANs. The devices must be VN-Segment aware with appropriate hardware support. Leaf switches must be configured for VN-Segment. The Virtual Network Identifier (VNI) is the network global ID, not the VLAN ID. Up to 4K VN-Segments and global VLANs are supported per leaf switch. There are only 4K VLANs. Different leafs can have different mapping to up to support 50K tenants on the fabric, depending on hardware and software limitations. If compatibility checks fail for the image, ISSD might be rejected. The VLAN-to-VN-Segment mapping must be consistent on the vpc+ peer switches for correct traffic flow. vpc type 1 consistency checks suspend VLANs on vpc peer swtiches with inconsistent mappings. Step 4 switch(config)# install feature-set fabricpath switch(config)# feature-set fabricpath switch(config)# feature vn-segment-vlan-based Installs the FabricPath feature set on the switch. Enables the FabricPath feature set on the switch. Enables the VN-Segment feature on the switch. 3
4 for a VLAN Step 5 switch(config)# copy running-config startup-config (Optional) Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. This example shows how to enable VN-Segment: switch(config)# install feature-set fabricpath switch(config)# feature-set fabricpath switch(config)# feature vn-segment-vlan-based switch(config)# copy running-config startup-config for a VLAN Before You Begin The VN-Segment feature must be enabled. switch(config)# vlan vlan-id Creates a VLAN. switch(config-vlan)# mode fabricpath Configures the VLAN as a FabricPath VLAN. VN-Segments for a VLAN must be configured in FabricPath mode on the Leaf. Step 4 Step 5 switch(config-vlan)# vn-segment segmentation-id switch(config-vlan)# copy running-config startup-config Defines the network global ID. The segmentation-id range is from 4096 to 16,773,119. (Optional) Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. This example shows how to configure VN-Segment for VLAN: switch(config)# vlan 100 switch(config-vlan)# mode fabricpath switch(config-vlan)# vn-segment
5 for VLAN in Configure Sync for VLAN in Configure Sync VN-Segments can be configured with the configure sync command for VPCs. switch# configure sync Enter configuration sync mode. switch(config-sync)# switch-profile test Creates a switch profile that contains a predetermined configuration. Step 4 Step 5 Step 6 switch(config-sync-sp)# vlan vlan-id switch(config-sync-sp-vlan)# vn-segment segmentation-id switch(config-sync-sp-vlan)# commit switch(config-sync-sp-vlan)# copy running-config startup-config Creates a VLAN. Defines the network global ID. The segmentation-id range is from 4096 to 16,773,119. (Optional) Synchronizes the configuration with the peer switch and applies the configuration locally. Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. This example shows how to configure VN-Segment for a VLAN in configure sync mode: switch# configure sync switch(config-sync)# switch-profile test Switch-Profile started, Profile ID is 1 switch(config-sync-sp)# vlan 3500 switch(config-sync-sp-vlan)# vn-segment switch(config-sync-sp-vlan)# in Transit Mode Before You Begin The FabricPath feature set must be enabled. switch(config)# fabricpath mode transit Enables transit mode. You need to save the configuration and reload the spine. 5
6 in Non-Transit Mode Note This command is disallowed if vn-segment-vlan-based is configured because they are mutually exclusive. The example shows how to configure VN-Segment in transit mode: switch(config)# fabricpath mode transit Enabling transit mode. Please save configuration and reload. What to Do Next Enter the show fabricpath mode command to show the status of the mode. in Non-Transit Mode You need to enter the feature vn-segment-vlan-based command on the spine to enable the spine in non-transit mode. Before You Begin The FabricPath feature set must be enabled. switch(config)# feature vn-segment-vlan-based switch(config)# vni vni-id Enables a VLAN-based VN-Segment. The range of vni-id is 4096 to 16,773,119. This example shows how to configure VN-Segment in non-transit mode: switch(config)# feature vn-segment-vlan-based switch(config)# vni Disabling VN-Segment Before You Begin VN-Segment configurations must be removed manually prior to disabling the feature. 6
7 Verifying VN-Segment Configuration switch(config)# no feature vn-segment-vlan-based switch(config)# copy running-config startup-config Disables VN-Segment. (Optional) Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. This example shows how to disable VN-Segment: switch(config)# no feature vn-segment-vlan-based Verifying VN-Segment Configuration Use the following commands to display VN- Segment configuration information: Command show vlan id vland-id-list vn-segment show vpc consistency-parameters global show vpc consistency-parameters vlans Displays the configured VLAN-to-VN-Segment mappings for the specified list of VLANs. Displays information on the number of VLANs and VN-Segment mappings on each VPC switch to help determine any mismatches. Displays information to identify the VLAN and VN-Segment configuration mismatches. 7
8 Verifying VN-Segment Configuration 8
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This chapter describes how to configure the Dynamic Host Configuration Protocol (DHCP) on a Cisco NX-OS device. This chapter includes the following sections: About DHCP Snooping About DHCP Snooping, on
Configuring NTP. Information About NTP. This chapter contains the following sections:
This chapter contains the following sections: Information About NTP, page 1 NTP as Time Server, page 2 Distributing NTP Using CFS, page 2 Clock Manager, page 2 High Availability, page 2 Virtualization
Use Case: Three-Tier Application with Transit Topology
Use Case: Three-Tier Application with Transit Topology About Deploying a Three-Tier Application with Transit Topology, on page 1 Deploying a Three-Tier Application, on page 3 Transit Routing with OSPF