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. 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. No license is granted by implication or otherwise under any patent or patent rights of SMC. [. . . ] Define an area as a totally stubby area only if routers in the area do not require summary LSAs from other areas. Note: This router supports up to 16 total areas (either normal transit areas, stubs, or NSSAs). 20-21 20 Unicast Routing Web - Click Routing Protocol, OSPF, Area Configuration. Set any area to a stub or NSSA as required, specify the cost for the default summary route sent into a stub, and click Apply. Figure 20-7 OSPF Area Configuration CLI - This example configures area 0. 0. 0. 1 as a normal area, area 0. 0. 0. 2 as a stub, and area 0. 0. 0. 3 as an NSSA. It also configures the router to propagate a default summary route into the stub and sets the cost for this default route to 10. Console(config-router)#network 10. 1. 1. 0 255. 255. 255. 0 area 0. 0. 0. 1 Console(config-router)#area 0. 0. 0. 2 stub summary Console(config-router)#area 0. 0. 0. 2 default-cost 10 Console(config-router)#area 0. 0. 0. 3 nssa Console(config-router)#end 42-26 42-27 42-24 42-28 20-22 Configuring the Open Shortest Path First Protocol Console#show ip ospf Routing Process with ID 192. 168. 1. 253 Supports only single TOS(TOS0) route Number of area in this router is 3 Area 0. 0. 0. 0 (BACKBONE) Number of interfaces in this area is 1 SPF algorithm executed 40 times Area 0. 0. 0. 2 (STUB) Number of interfaces in this area is 1 SPF algorithm executed 8 times Area 0. 0. 0. 3 (NSSA) Number of interfaces in this area is 1 SPF algorithm executed 40 times Console# 20 42-39 Configuring Area Ranges (Route Summarization for ABRs) An OSPF area can include a large number of nodes. If the Area Border Router (ABR) has to advertise route information for each of these nodes, this area ABR area wastes a lot of bandwidth and processor time. Instead, you can configure an ABR to advertise a summary route single summary route that covers all the individual networks within its area. When using route summaries, local changes do not have to be propagated to other area routers. This allows OSPF to be easily scaled for larger networks, and provides a more stable network topology. Command Usage · Use the Area Range Configuration page to summarize intra-area routes, and advertise this information to other areas through Area Border Routers (ABRs). The summary route for an area is defined by an IP address and network mask. You therefore need to structure each area with a contiguous set of addresses so that all routes in the area fall within an easily specified range. If it is not possible to use one contiguous set of addresses, then the routes can be summarized for several area ranges. This router also supports Variable Length Subnet Masks (VLSMs), so you can summarize an address range on any bit boundary in a network address. · To summarize the external LSAs imported into your autonomous system (i. e. , local routing domain), use the Summary Address Configuration screen (page 20-33). Command Attributes · Area ID ­ Identifies an area for which the routes are summarized. (The area ID must be in the form of an IPv4 address. ) · Range Network ­ Base address for the routes to summarize. · Advertising ­ Indicates whether or not to advertise the summary route. If the routes are set to be advertised, the router will issue a Type 3 summary LSA for each specified address range. If the summary is not advertised, the specified routes remain hidden from the rest of the network. (Default: Advertise) 20-23 20 Unicast Routing Note: This router supports up 64 summary routes for area ranges. Specify the area identifier, the base address and network mask, select whether or not to advertise the summary route to other areas, and then click Apply. Figure 20-8 OSPF Range Configuration CLI - This example summarizes all the routes for area 1. Note that the default for the area range command is to advertise the route summary. The configured summary route is shown in the list of information displayed for area 1. Console(config-router)#area 0. 0. 0. 1 range 10. 1. 1. 0 255. 255. 255. 0 Console(config-router)#end Console#show ip ospf Routing Process with ID 10. 1. 1. 253 Supports only single TOS(TOS0) route Number of area in this router is 4 Area 0. 0. 0. 0 (BACKBONE) Number of interfaces in this area is 0 SPF algorithm executed 47 times Area 0. 0. 0. 1 Number of interfaces in this area is 3 SPF algorithm executed 14 times Area ranges are 255. 255. 255. 0/24 Active Console# 42-23 20-24 Configuring the Open Shortest Path First Protocol 20 Configuring OSPF Interfaces You should specify a routing interface for any local subnet that needs to communicate with other network segments located on this router or elsewhere in the network. [. . . ] 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. [. . . ]