Properly designing the distribution block ensures the stability of the overall architecture. Aside from Layer-2 or Layer-3 EtherChannel mode, similar configuration must be applied on each system in the access-distribution block and WAN edge. Similar static PIM-SM configuration must be enabled on each Layer-3 PIM router or an access-switch in the school sites: Upon successful PIM-SM RP implementation throughout the school network, PIM-SM must be enabled on Layer-3 edge and core network-facing ports. It is recommended to deploy multicast in PIM-SM in the Schools SRA. The implementation for each switch is different, and is discussed separately in the sections which follow. Figure 3-32 Depicts All Three QoS Implementation Method. In Cisco Catalyst platforms, EtherChannel load balancing is performed in hardware and it cannot perform per-packet-based load balancing among different member links within EtherChannel. In static mode, Etherchannel consistency check is not performed between two switches, which may lead to network protocol instability or network outage due to mis-configuration. Deploy another 3750-ME —Deploying another 3750-ME is the simplest way to scale the WAN capacity. Figure 3-2 Multi Building Large School Network Design. Both EtherChannel modes can coexist in a single system; however, the protocols (PagP, LACP) can not interoperate with each other. •Shared—Shared mode also provides guaranteed bandwidth for each queue; however, it allows the flexibility of using excess bandwidth when there is any available. EtherChannel helps improve the overall network stability and availability. Each school site is connected to the district office over the WAN infrastructure. The Cisco 3750-E StackWise Plus delivers high performance routing and switching capability and robust IOS feature support. Network recovery techniques vary based on the different platforms. hbspt.cta._relativeUrls=true;hbspt.cta.load(2221797, '94937510-937d-46b4-b1e7-3f3646a52d5c', {}); In order to maximize the benefits of these and other technologies, schools must find network solutions that resolve the challenges of today while helping future-proof the network for tomorrow’s growing access and device needs. Therefore, it is recommended to summarize at the distribution router, and not summarize at the access-layer. Figure 3-26 Fixed Configuration Catalyst QoS Architecture. All the deployment and configuration guidelines in this section are the same for deploying in the district office or school site network. Cisco Catalyst 4500 and 6500 are high density, resilient switches for large scale networks. Following is the configuration example to implement UDLD protocol: This section provides implementation and best practices guidelines to deploy routed-access in the access-distribution block. By default, the router transmits and accept EIGRP hello messages from remote device to form an adjacency on all EIGRP enabled interfaces. The following is a sample configuration to enable EIGRP routing process at the edge of the district office collapsed core network. Limited Scope - Administratively scope address that remains constrained within local organization or AS. The design principles remain the same when deploying a Catalyst 6500. In this mode, the power system does not provide 1+1 power redundancy. Figure 3-20 illustrates where Layer-2 and Layer-3 forwarding entry processing and storage takes place when access-distribution block is implemented as multi-layer versus routed-access network. Deploying a VPN service over the Internet requires an overlay VPN network such as DMVPN to provide secure VPN service. Compare and purchase network hardware, such as routers, switches, modems and firewalls. In a large network, this may become a scalability issue (i.e. Migrate to Modular a switching platform (such as Catalyst 6500)—Migrating to a modular switching platform in the WAN aggregation tier enables higher bandwidth, capacityy, and may reduce operational and management complexities. Etherchannel and UDLD are two design features which are included in the network foundation services, which contribute to network resiliency. This can result in traffic reaching receivers local to the source and located between the source and the RP. The devices (routers, switches) within the internal network are managed by the system administrator, and hence are classified as trusted devices. Because paths and ports are not down, hardware keeps forwarding the packet to a valid next-hop while supervisor switchover is occurring. The Cisco Catalyst 4500 switch supports redundant supervisor engines and provides Stateful Switchover (SSO) and Non-Stop Forwarding (NSF) capabilities. PIM-SM begins with an empty distribution tree and adds branches only as the result of explicit IGMP requests to join. Following is the example configuration to enable basic EIGRP routing in the distribution layer and in the access layer: EIGRP creates and maintains a single flat routing network topology between EIGRP peers. The Cisco Catalyst 4500 can support up to 64 EtherChannels, whereas the Cisco Catalyst 3750 StackWise can support up to 48 EtherChannels per-system. A flexible network design allows any legitimate device to be connected anywhere in the network (eg IP Phone, printer, video surveillance camera, digital signage, etc). For example, IOS release mismatch between two supervisors may not allow SSO to synchronize. The multicast IP address space is further divided into several pools for well-known multicast network protocols, and inter-domain multicast communications as shown in Table 3-8. •Only the Catalyst 3650-E and 3750-E support policing on 10 Gigabit Ethernet interfaces. An attacker can detect EIGRP operation and send flood of EIGRP hello messages to destabilize the network. If the SSO dependency configuration checks successfully pass, then SSO communication between both supervisors goes through several synchronization states before it transitions to hot-standby state as illustrated in the following output: All the state-machines and dynamic information of SSO-capable protocols are automatically synchronized to the standby supervisor module without any additional operational requirement. The skills required to put together cohesive a set of drawings that meet all code for permitting, how to work with contractors, manage clients, land new projects, and legally practice architecture in a overly complicated modern world is just way outside the scope of architecture school. When loads are balanced in this manner, packets belonging to a single flow will retain their packet order. the committed rate agreed to with Service Provider). Network outages may be either planned or unplanned. There are three basic ways to assign VLANs within the access-distribution block. This chapter describes the Schools Service Ready Architecture network design, which is a well designed and tested network architecture that is flexible, and cost effective to support a wide range of educational services. Network to recover from fault conditions thus providing 1:1 hot redundancy to protect a. Traffic type a unique VLAN for each group EtherChannel provides efficient network operation graceful... 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