NX-OS and Cisco Nexus Switching: Next-Generation Data Center Architectures (Networking Technology)

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Contents

  1. NX-OS And Cisco Nexus Switching: Next-Generation Data Center Architectures (Networking Technology)!
  2. What is Kobo Super Points?
  3. NX-OS and Cisco Nexus Switching: Next-Generation Data Center Architectures, Rough Cuts
  4. NX-OS and Cisco Nexus Switching: Next-Generation Data Center Architectures (Networking Technology)
  5. See a Problem?

If an existing configuration is applied to the interface that makes it incompatible with the port- channel, the channel-group might be rejected from time to time. In these instances, chan- nel compatibility can be ensured by adding the force command. This is accomplished with the feature command.

NX-OS And Cisco Nexus Switching: Next-Generation Data Center Architectures (Networking Technology)!

If both sides of the link are configured for passive, they will not be bundled. Example shows how to assign a physical port to a port-channel with LACP. Example shows the compatibility parameters that must match for a port to bundle. If they are configured in AUTO speed, they have to negotiate the same speed when they come up. If a member negotiates a different speed, it will be suspended. This only applies to ethernet port-channel.

What is Kobo Super Points?

Note In IOS devices, port-channel interfaces are initially put into an administratively down state, whereas, in NX-OS newly created port-channels are active as soon as they are created. Port Channel Flow Control Flow control is supported on port-channel interfaces as well.

For flow control to work properly, both sides of the port-channel must be configured. By default, the port-channel flow control is desired. Flow control can be statically configured for on or off and for each direction. Example shows how to configure and verify port-channel flow control.

NX-OS and Cisco Nexus Switching: Next-Generation Data Center Architectures, Rough Cuts

From time to time, it is good to verify that traffic is load-balanced across all of the available members. A useful command to get a quick snap- shot of these statistics is show port-channel traffic. Example shows example output from this command. As shown in Example , the show port-chan- nel loadbalance forwarding-path command can be used to gather this information. Example Determining Which Link a Particular Flow Will Use francevdc1 show port-channel load-balance forwarding-path interface port-channel 11 src-ip Virtual Port Channels The Nexus and series switches take port-channel functionality to the next level by enabling links that are connected to different devices to be aggregated into a sin- gle, logical link.

This technology was introduced in NX-OS version 4. The vPC peer-keepalive link can be ei- ther 1 Gbps or 10 Gbps. Note The mgmt0 interface can be used as the vPC peer-keepalive link but should be avoided if at all possible. On the Nexus , the mgmt0 is actually a logical interface rep- resenting the physical management port of the active supervisor. During processes such as supervisor switchover during hardware failure or In-Service Software Upgrades ISSU , the physical link supporting the mgmt0 interface might change, causing a disruption of the keepalive messages.

By using normal switch interfaces, additional levels of redundnancy in the port-channels can be used. If the mgmt0 interface is used as the peer-keepalive link, it is critical to ensure that all physical management ports are connected to an external device, such as a management switch. The remainder of this section demonstrates configuration based on the topology illus- trated in Figure Step 1. Enable the vPC feature on each vPC peer:!

Congo Congo conf t Enter configuration commands, one per line. Egypt Egypt config feature vpc Egypt config exit Step 2. Congo Congo config-if vrf context vpc-keepalive Congo config-vrf exit! Egypt Egypt config vrf context vpc-keepalive Egypt config-vrf exit! Verify connectivity of the VPC peer keepalive link: Congo ping 1. Configure the vPC peer-link:! Congo config-if! Egypt Egypt conf t Enter configuration commands, one per line.

Egypt config-if Note Interfaces that are members of the VPC peer-link must be 10 GbE ports, and it is recommended that they are in dedicated rate-mde. Add port-channels to a VPC:! This feature is designed to enable certain storage, application servers or load balancers to implement fast-path functionality. To enable the peer-gateway, enter the following command: Congo config-vpc-domain peer-gateway Unidirectional Link Detection Full-duplex communication creates a situation in which a node can receive traffic but cannot transmit or vice versa; this condition is known as a unidirectional link and can be problematic for protocols that require a bidirectional exchange of information.

This con- dition is most often attributed to fiber optic cabling as the physical medium. It is also possible for unidirectional link conditions to exist in other mediums such as twisted-pair copper cabling. Although upper layer protocols can overcome this scenario easily, this scenario can produce unexpected results at Layer 2.

Data Center:Network:Cisco:Nexus:Quality of Service (QoS)

For these Layer 2 protocols, Cisco provides a mechanism for detecting and disabling links where bidirectional traffic flow is not possible. Cisco developed Unidirectional Link Detection UDLD to eliminate any negative behavior associated with the failure of bidirectional communication. UDLD enables each device to send packets to the directly connected device at periodic intervals 15 seconds by default ; the sending and receiving of these packets ensures that traffic flow is bi-directional.

The Route Policy Manager supports complex configu- rations, tight routing control, and migrations from one protocol to another. EIGRP is a highly scala- ble, flexible, and robust routing protocol considered a hybrid of distance vector and link- state protocols.


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Considered a hybrid routing protocol, EIGRP implements the best characteristics of both distance vector and link-state protocols such as the hello mecha- nism and incremental updates. The primary advantage that DUAL pro- vides over other routing algorithms is the capability to provide loop-free topologies at every stage of network convergence. When joined with the other capabilities of EIGRP, such as its multiprotocol nature; WAN friendly neighboring and updating capabilities; and flexible summarization and quick convergence, it makes for a powerful routing protocol.

EIGRP forms adjacencies with its directly connected neighbors to exchange routing updates similar to a link state protocol. During the initial neighbor formation, attributes such as smooth round trip time SRTT , hold time, retry timeout, IP address, and inter- face on which the hello was received are negotiated and recorded in a neighbor table, as demonstrated in Example Within the hello is a hold timer that tells EIGRP the maximum time before the next hello should be received. By default, the hold timer is three times the hello interval.

These differences will be highlighted throughout the section. Assign interfaces to the instance tag. Configure passive interfaces if necessary. Configure network summarization. Configure the redistribution of other protocols if necessary. The first step to configure EIGRP is to enable it in global configuration mode using the feature command, as demonstrated in Example Without the feature enabled, it would not be resident in memory.


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  8. Congo config feature eigrp Congo config end Congo show run eigrp! Command: show running-config eigrp! Time: Tue Sep 29 version 4. In NX-OS, you configure an instance tag for the process.

    NX-OS and Cisco Nexus Switching: Next-Generation Data Center Architectures (Networking Technology)

    In NX-OS the instance tag can be the AS, but additionally the instance tag can be up to 20 case-sensitive alphanumeric characters. Congo config router eigrp Congo config-router exit Congo config show run eigrp! Congo config router eigrp DataCenter1 Congo config show run eigrp! Congo config router eigrp DataCenter1 Congo config-router autonomous-system Congo config-router exit Congo config show run eigrp!

    Note that this is different from traditional IOS configuration where you configure a network statement under the routing process, and then, in turn, any interface on the router that fell within that network range was advertised. The approach taken in NX-OS is much more granular and enables additional levels of control over which networks are advertised. Although this default setup is wanted, there might be designs in which forming multiple EIGRP adjacencies between the same pair of switches is not wanted due to the potential impact of network convergence time and unnecessary duplicate next hops.


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    In configurations such as this, use the passive- interface command, as demonstrated in Example A passive interface accomplishes the requirement of advertising the subnet via EIGRP, but also instructing the EIGRP process to not listen to hellos on the interfaces configured to be passive. Command: show running-config interface Vlan! This enables network designers to summarize their networks for maximum efficiency without the constraints of specific borders or other topological designations.

    When a network is summarized, a single entry with a shorter prefix commonly called a supernet is created and added to the routing table as a representation of the longer prefix subnets. The exam- ples that follow show how to create a summary for Note Note with this summary, the following networks are represented: Libya When EIGRP stub routing is enabled, the router advertises a smaller subset of networks dependent on the configuration.

    See a Problem?

    Stub routing is configured under the address-family mode in the routing process, as demonstrated in Example , for the network topology shown in Figure Chapter 3: Layer 3 Support and Configurations Example Configuring EIGRP Stub Routing with Alphanumeric Tags Congo config t Congo config router eigrp DataCenter1 Congo config-router address-family ipv4 unicast Congo config-router stub Congo config-router end The stub status of a neighbor can be identified in the detail output from show ip eigrp neighbor detail, as demonstrated in Example EIGRP authentication is enabled either at the routing process level or per- interface allowing for flexible deployment options.

    Note Note that interface-level authentication overrides the process-level configuration. You must first define a key chain that contains attributes such as the password to be used to authenticate the connection, and the lifetime of the key chain for both sending and receiving, as demon- strated in the configuration in Example , for the network topology in Figure This step is completed under the address-family configuration. It is necessary to specify an encryption mechanism, MD5, and configure the key chain to use.

    Note Note that the use of address-family commands provides the ability to group proto- col-specific attributes such as stub, authentication, and redistribution. This flexibility allows for complex routing scenarios with a fine level of control.