User manual SMC 8926EM

[. . . ] MANAGEMENT GUIDE ta SMC8926EM SMC8950EM TigerStack II 10/100/1000 24/48-Port Stackable Layer 3 Gigabit Switch TigerStack II 10/100/1000 Management Guide From SMC's Tiger line of feature-rich workgroup LAN solutions 20 Mason Irvine, CA 92618 Phone: (949) 679-8000 August 2009 Pub. # 149100000035A E082009-MW-R01 Information furnished by SMC Networks, Inc. (SMC) is believed to be accurate and reliable. However, no responsibility is assumed by SMC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. [. . . ] When changing to a new key, the router will send multiple copies of all protocol messages, one with the old key and another with the new key. Once all the neighboring routers start sending protocol messages back to this router with the new key, the router will stop using the old key. This rollover process gives the network administrator time to update all the routers on the network without affecting the network connectivity. Once all the network routers have been updated with the new key, the old key should be removed for security reasons. 20-27 20 Unicast Routing Web - Click Routing Protocol, OSPF, Interface Configuration. Select the required interface from the scroll-down box, and click Detailed Settings. Figure 20-9 OSPF Interface Configuration Change any of the interface-specific protocol parameters, and then click Apply. Figure 20-10 OSPF Interface Configuration - Detailed 20-28 Configuring the Open Shortest Path First Protocol CLI - This example configures the interface parameters for VLAN 1. Console(config)#interface vlan 1 Console(config-if)#ip ospf priority 5 Console(config-if)#ip ospf transmit-delay 6 Console(config-if)#ip ospf retransmit-interval 7 Console(config-if)#ip ospf hello-interval 5 Console(config-if)#ip ospf dead-interval 50 Console(config-if)#ip ospf cost 10 Console(config-if)#ip ospf authentication message-digest Console(config-if)#ip ospf message-digest-key 1 md5 aiebel Console# 20 42-37 42-38 42-38 42-36 42-36 42-35 42-32 42-34 Configuring Virtual Links All OSPF areas must connect to the backbone. If an area does not have a direct physical connection to the isolated backbone, you can configure a area virtual link that provides a logical path to the backbone. To connect an isolated area to the backbone, the ABR logical path can cross a single non-backbone area (i. e. , transit area) virtual link to reach the backbone. To define this backbone ABR path, you must configure an ABR normal that serves as an endpoint area connecting the isolated area to the common transit area, and specify a neighboring ABR as the other endpoint connecting the common transit area to the backbone itself. (Note that you cannot configure a virtual link that runs through a stub or NSSA area. ) Virtual links can also be used to create a redundant link between any area and the backbone to help prevent partitioning, or to connect two existing backbone areas into a common backbone. Any area disconnected from the backbone must include the transit area ID and the router ID for a virtual link neighbor that is adjacent to the backbone. Command Attributes · Area ID ­ Identifies the transit area for the virtual link. (The area ID must be in the form of an IPv4 address. ) · Neighbor Router ID ­ Router ID of the virtual link neighbor. This specifies the Area Border Router (ABR) at the other end of the virtual link. To create a virtual link, it must be configured for an ABR at both ends of the link. One of the ABRs must be next to the isolated area and the transit area at one end of the link, while the other ABR must be next to the transit area and backbone at the other end of the link. (Default: None) The other items are described under "Configuring OSPF Interfaces, " page 20-25. 20-29 20 Unicast Routing Note: This router supports up 64 virtual links. Web - Click Routing Protocol, OSPF, Virtual Link Configuration. To create a new virtual link, specify the Area ID and Neighbor Router ID, configure the link attributes, and click Add. To modify the settings for an existing link, click the Detail button for the required entry, modify the link settings, and click Set. Figure 20-11 OSPF Virtual Link Configuration CLI - This example configures a virtual link from the ABR adjacent to area 0. 0. 0. 4, through a transit area to the neighbor router 10. 1. 1. 252 at the other end of the link which is adjacent to the backbone. Console(config-router)#area 0. 0. 0. 0 virtual-link 10. 1. 1. 252 Console(config-router)# 42-30 20-30 Configuring the Open Shortest Path First Protocol 20 Configuring Network Area Addresses OSPF protocol broadcast messages (i. e. , Link State Advertisements or LSAs) are restricted by area to limit their impact on network performance. A large network should be split up into separate OSPF areas to increase network stability, and to reduce protocol traffic by summarizing routing information into more compact messages. Each router in an area shares the same view of the network topology, including area links, route summaries for directly connected areas, and external links to other areas. Command Usage · Use the Network Area Address Configuration page to specify an Area ID and the corresponding network address range. [. . . ] This is related directly to the hardware interface for network devices and passes on traffic based on MAC addresses. Layer 3 Network layer in the ISO 7-Layer Data Communications Protocol. This layer handles the routing functions for data moving from one open system to another. Link Aggregation See Port Trunk. Link Aggregation Control Protocol (LACP) Allows ports to automatically negotiate a trunked link with LACP-configured ports on another device. Management Information Base (MIB) An acronym for Management Information Base. It is a set of database objects that contains information about a specific device. Glossary-4 Glossary MD5 Message-Digest Algorithm An algorithm that is used to create digital signatures. It is intended for use with 32 bit machines and is safer than the MD4 algorithm, which has been broken. [. . . ]