Static Routing and Serial interfaces. 1 st semester
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1 Static Routing and Serial interfaces 1 st semester
2 Outline Static Routing Implementation Configure Static and Default Routes Review of CIDR Configure Summary and Floating Static Routes Troubleshoot Static and Default Route Issues Summary
3 Configuring router serial interfaces
4 Point-to-point WAN link The simplest type of WAN link, also called a leased line or leased circuit. Point-to-point link uses synchronous serial lines
5 Configuring Serial Interface The basic configuration of a serial connection is no different than the other types of interfaces
6 Synchronous Communication The serial links used between two routers typically use synchronous communication, which means that both routers on the ends of the leased line must use the exact same speed for sending and receiving bits. Serial interfaces will usually be attached to a CSU/DSU type of device that provides clocking for the line. Clocking typically provided by DCEs to routers.
7 Synchronous Communication In the lab, to synchronize the clocks on the serial interfaces of both routers on the ends of a serial link, one end must provide clocking.
8 Setting the Clock Rate The clock speed controls the speed at which data is sent over the connection in bits per second (bps). Enable clocking on the router that is connected to the DCE cable
9 Setting the Clock Rate To find the clock rates that are available on a router
10 Let s Build a Following Network
11 Static Routing
12 Static Routing Reach Remote Networks A router can learn about remote networks in one of two ways: Manually - Remote networks are manually entered into the route table using static routes. Dynamically - Remote networks are automatically learned using a dynamic routing protocol.
13 Static Routing Static route A static route is created, maintained, and updated by a network administrator, manually. A static route to every network must be configured on every router for full connectivity.
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16 Static Routing Why Use Static Routing? Static routing provides some advantages over dynamic routing, including: Static routes are not advertised over the network, resulting in better security. Routers not share static routes with each other, thus reducing CPU/RAM overhead and saving bandwidth.
17 Static Routing Why Use Static Routing? (continued) Static routing has the following disadvantages: Initial configuration and maintenance is timeconsuming. Configuration is error-prone, especially in large networks. Administrator intervention is required to maintain changing route information. Does not scale well with growing networks; maintenance becomes cumbersome. Requires complete knowledge of the whole network for proper implementation.
18 Static Routing When to Use Static Routes Static routing has three primary uses: 1. Small networks: Providing ease of routing table maintenance in smaller networks that are not expected to grow significantly. 2. Default route: Using a single default route to represent a path to any network that does not have a more specific match with another route in the routing table. Default routes are used to send traffic to any destination beyond the next upstream router.
19 Static Routing When to Use Static Routes 3. Routing to and from stub networks. A stub network is a network accessed by a single route, and the router has no other neighbors (only one router).
20 Static Routing Activity - Identify the Advantages and Disadvantages of Static Routing
21 Types of Static Routes Static Route Applications Static Routes are often used to: 1. Connect to a specific network 2. Provide a Gateway of Last Resort for a stub network 3. Summarize routing table entries 4. Create a backup route in case a primary route link fails
22 Types of Static Routes Standard Static Route Static route can be used to connect to a specific network ( like for example a stub network)
23 Types of Static Routes Default Static Route Static route can be used to configure default route. A default static route is a route that matches all packets. A default route identifies the gateway IP address to which the router sends all IP packets that it does not have a learned or static route. A default static route is simply a static route with /0 as the destination IPv4 address. Configuring a default static route creates a Gateway of Last Resort.
24 Types of Static Routes Default Static Route Default static routes are used: When no other routes in the routing table match the packet destination IP address. When a router has only one other router to which it is connected. This condition is known as a stub router.
25 Types of Static Routes Summary Static Route
26 Types of Static Routes Summary Static Route To reduce the number of routing table entries, multiple static routes can be summarized into a single static route if: The destination networks are contiguous and can be summarized into a single network address. The multiple static routes all use the same exit interface or next-hop IP address.
27 Types of Static Routes Floating Static Route Floating static routes are static routes that are used to provide a backup path to a primary static or dynamic route, in the event of a link failure. The floating static route is only used when the primary route is not available. In order to accomplish this, the floating static route is configured with a higher administrative distance than the primary route.
28 Types of Static Routes Activity - Identify the Type of Static Route
29 Configure IPv4 Static Routes ip route Command Next hop
30 Configure IPv4 Static Routes Next-Hop Options The next hop can be identified by an IP address, exit interface, or both. How the destination is specified creates one of the three following route types: When only the next-hop IP address is specified Next-hop static route. When only the router exit interface is specified Directly connected static route. When the next-hop IP address and exit interface are specified Fully specified static route.
31 Configure IPv4 Static Routes Configure a Next-Hop Static Route
32 Configure IPv4 Static Routes Configure a Next-Hop Static Route In a next-hop static route, only the next-hop IP address is specified. The output interface is derived from the next hop. The router performs multiple lookups in the routing table before forwarding a packet( a recursive lookup). Because recursive lookups consume router resources, they should be avoided when possible.
33 Configure IPv4 Static Routes Configure Directly Connected Static Route When configuring a static route, another option is to use the exit interface to specify the next-hop address.
34 Configure IPv4 Static Routes Configure Directly Connected Static Route Configuring a directly connected static route with an exit interface allows the routing table to resolve the exit interface in a single search, instead of two searches. Although the routing table entry indicates directly connected, the administrative distance of the static route is still 1. Only a directly connected interface can have an administrative distance of 0. Note: For point-to-point interfaces, you can use static routes that point to the exit interface or to the next-hop address. For multipoint/broadcast interfaces, it is more suitable to use static routes that point to a next-hop address.
35 Configure IPv4 Static Routes Configure a Fully Specified Static Route In a fully specified static route, both the output interface and the next-hop IP address are specified. This is another type of static route that is used in older IOS s, prior to CEF. This form of static route is used when the output interface is a multi-access interface and it is necessary to explicitly identify the next hop. The next hop must be directly connected to the specified exit interface.
36 Configure IPv4 Static Routes Configure a Fully Specified Static Route
37 Configure IPv4 Static Routes Verify a Static Route Along with ping and traceroute, useful commands to verify static routes include: show ip route show ip route static show ip route network
38 Configure IPv4 Static Routes Verify a Static Route
39 Configure IPv4 Default Routes Default Static Route
40 Configure IPv4 Default Routes Configure a Default Static Route
41 Configure IPv4 Default Routes Verify a Default Static Route Note the asterisk (*)next to the route with code S. The asterisk indicates that this static route is a candidate default route, which is selected as the Gateway of Last Resort.
42 Classful Addressing Classful Network Addressing and Default Subnet Masks Class A Class B Class C
43 CIDR Classless Inter-Domain Routing Classful Addressing Waste The overall result was that the classful addressing was a very wasteful addressing scheme. A better network addressing solution had to be developed. For this reason, Classless Inter-Domain Routing (CIDR) was introduced in 1993.
44 CIDR Classless Inter-Domain Routing CIDR also reduces the size of routing tables and manages the IPv4 address space more efficiently using: Route summarization: Also known as prefix aggregation, routes are summarized into a single route to help reduce the size of routing tables. Supernetting: Occurs when the route summarization mask is a smaller value than the default traditional classful mask. Note: A supernet is always a route summary, but a route summary is not always a supernet.
45 CIDR CIDR and Route Summarization
46 CIDR Static Routing CIDR Example
47 Configure IPv4 Summary Routes Calculate a Summary Route
48 Configure IPv4 Summary Routes Route Summarization CIDR is a form of route summarization and is synonymous with the term supernetting. CIDR ignores the limitation of classful boundaries, and allows summarization with masks that are smaller than that of the default classful mask. This type of summarization helps reduce the number of entries in routing updates and lowers the number of entries in local routing tables.
49 Configure IPv4 Summary Routes Summary Static Route Example
50 Types of Static Routes Activity - Determine the Summary Network Address and Prefix
51 Configure Floating Static Routes Floating Static Routes Floating static routes are static routes that have an administrative distance greater than the administrative distance of another static route or dynamic routes. The administrative distance of a static route can be increased to make the route less desirable than that of another static route or a route learned through a dynamic routing protocol. In this way, the static route floats and is not used when the route with the better administrative distance is active. However, if the preferred route is lost, the floating static route can take over, and traffic can be sent through this alternate route.
52 Configure Floating Static Routes Configure a Floating Static Route Default static route Floating default static route
53 Configure Floating Static Routes Test the Floating Static Route Use a show ip route command to verify that the routing table is using the default static route. Use a traceroute command to follow the traffic flow out the primary route. Disconnect the primary link or shutdown the primary exit interface. Use a show ip route command to verify that the routing table is using the floating static route. Use a traceroute command to follow the traffic flow out the backup route.
54 Troubleshoot IPv4 Static and Default Route Configuration Troubleshoot a Missing Route Common IOS troubleshooting commands include: ping traceroute show ip route show ip interface brief show cdp neighbors detail
55 Summary Static routes can be configured with a next-hop IP address, which is commonly the IP address of the next-hop router. When a next-hop IP address is used, the routing table process must resolve this address to an exit interface. On point-to-point serial links, it is usually more efficient to configure the static route with an exit interface. On multi-access networks, such as Ethernet, both a next-hop IP address and an exit interface can be configured on the static route. Static routes have a default administrative distance of "1".
56 Summary (continued) A static route is only entered in the routing table if the next-hop IP address can be resolved through an exit interface. Whether the static route is configured with a next-hop IP address or exit interface, if the exit interface that is used to forward that packet is not in the routing table, the static route is not included in the routing table. In many cases, several static routes can be configured as a single summary route. If there is not a more specific match in the routing table, the routing table uses the default route to forward the packet to another router. A floating static route can be configured to back up a main link by manipulating its administrative value.
57 Any Question?
Smart Serial. Show interfaces. Shut down. logging synchronous
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