1. Eigrp To Bgp Redistribution Timers Download

• BGP routers will redistribute routing information (peering) with all IGP routers on the network (EIGRP, RIP, OSPF etc) which involve exchange of full routing tables. Once that is finished, incremental updates are sent with topology changes. The BGP default keepalive timer is 60 seconds while the hold timer is 180 seconds.
• Oct 22, 2013  Tutorial of 5 common Network Protocols – IGRP, EIGRP, OSPF, ISIS, BGP. IGRP, EIGRP, OSPF, IS-IS and BGP. Now, let’s explain these networking protocols one by one in order to make it clear. Interior Gateway Routing Protocol (IGRP). Redistribution between IGRP and EIGRP is also automatic. There is support for a hop count of 255.

Redistributing Routes with BGP / BGP from Cisco IOS Cookbook. Router2(config)#router bgp 65520 Router2(config-router)#redistribute eigrp 99 metric 500. Although we have only assigned a default metric. NTP and Time.

Perhaps one of the most colorful descriptions for route maps is that routemaps are like duct tape for the network—not necessarily because they can beused to fix or mend something broken, but because they can be applied tonumerous situations to address many issues. At times, they may not be the most'pretty solutions,' but they will be very effective.

After you learnto configure and use route maps, you will soon see why some engineers refer tothem as route tape. In policy-based routing (PBR), for instance, you mayuse a route map when traffic has to follow a particular path through theinternetwork. This path may differ from the path the routing protocol wants toforward traffic on. PBR, along with route maps, enables the network engineer toessentially override the route table and influence which way traffic flows.You also can apply route maps in a number of ways. The following listcontains some of the more common and powerful applications of route maps:.Route filtering during redistribution between routing protocols.Route control and attribute modification on BGP neighbors.Route metric modification or tagging during redistribution betweenrouting protocols.Policy-based routing (PBR)After you have route maps in your engineering tool kit, you will have one ofthe most powerful and versatile configuration options available on Ciscorouters.

This chapter discusses how to configure and use route maps and how toconfigure PBR. Route Map OverviewRoute maps are much like the 'If. Statements ofmany programming languages. If a certain condition is true, thendo something. Route maps enable you to define routing policy that will beconsidered before the router examines its forwarding table; therefore, you candefine routing policy that takes precedence over the different route processes.This is why route maps are some of the most powerful commands you can use on arouter. Example 2-1 highlights route map logic.

NOTEWhen using the match ip address command in BGP, you can use route mapsonly to filter outbound updates. The use of a match ip address route mapis not supported on inbound BGP updates.The next-hop keyword is used primarily in BGP, but it can also be usedwhen redistributing routes based on the next-hop IP address that correlates tothe route. In this case, the router will examine the NEXTHOP attribute for thiscomparison.The route-source keyword enables you to match a router'sadvertising IP address.

If you view the IP route table, and route 172.16.3.0/24is advertised from the IP address of 172.16.2.1, for instance, theroute-source keyword is used to match the advertising router's IPaddress of 172.16.2.1. In the next sections, these commands are applied topractical examples to show you how they function. Practical Example: Matching the Route Source and IP AddressIn this model, four routers on a common LAN segment are running two routingprotocols.

The routers earp and holliday are running EIGRP as the routing protocol,and the routers ringo and clanton are running OSPF. The router ringo is functioningas an OSPF autonomous system boundary router (ASBR) by redistributing betweenEIGRP and OSPF. The ringo router is receiving several routes from the earp andholliday routers, as depicted in.In this practical example, a route map is applied during the redistributionof EIGRP into OSPF on the ringo router. The route map named settag3 iscalled on the redistribution process for OSPF on the ringo router. The firstroute map instance, route-map settag3 permit 100, will perform a matchon IP route-source.

This statement will match only routes wherethe advertising IP address is found in ACL 5—in this case, the address172.16.10.3. Not only will these routes be allowed for redistribution, but thetag of 3 will also be set.Route Map Practical Example: Matching the Route Source and IPAddress.

NOTEPolicy routing only works on inbound packets; therefore, it must be appliedto the incoming traffic or to the interface receiving the traffic to be policyrouted. To policy route local traffic, you must have local policy routingenabled. Practical Example: Policy-Based RoutingThis section examines how you may use policy routing to control traffic inthe internetwork.

Eigrp To Bgp Redistribution Timers Download

In the network model depicted in Figure 2-9, a policy routeexists on the tombstone router to control traffic from the ringo and curlybillrouters. The policy states that all IP traffic from the ringo router will beforwarded to holliday, whereas all IP traffic from the curlybill router will beforwarded to earp.

All other IP traffic will be handled by the normal routingprocedure.Policy-Based RoutingTo control the traffic from the ringo and curlybillrouters, this example uses policy routing and route maps on the tombstonerouter. Policy routing will be enabled on the E0/1 interface of the tombstonerouter. This is the inbound interface, or the interface that will be receivingtraffic from the ringo and curlybill routers. The route map used in this model,policy1, will have two route map instances. One will match packets from theringo router, 172.16.64.10, and set the next hop to be 172.16.10.4, theholliday router.

The other route map instance will match packets from thecurlybill router, 172.16.64.5, and set the next hop to be 172.16.10.3,the earp router.The route/forwarding table on the tombstone router shows that there are twopaths to the routes 172.16.33.0/24, 172.16.34.0/24, and 172.16.200.0/24 thatreside on the turkeycreek router. One path passes through the earp router,whereas the other one passes through the holliday router. Example 2-25 lists theroute table of the tombstone router. NOTEThe set ip next-hop and set ip default next-hop commands aresimilar but function differently.

The set ip next-hop command causes therouter to use policy routing first and then use the route table. The set ipdefault next-hop command causes the router to use the route table first andthen policy route to the specified default next hop.Step 4(Optional) Define and configure any ACLs that will beused with the new routing policy. With extended ACLs, for example, you can usepolicy to forward traffic based on traffic type (for instance, traffic one way,and FTP traffic another).

You can also use ACLs to route traffic fromspecific addresses. When you use standard ACLs, policy routing compares thesource IP address in the packet to the ACL.Step 5Configure policy routing on the inbound interface. Toconfigure policy routing for an interface, use the following interfacecommand:router(config-if)# ip policy route-maproute-mapnameStep 6(Optional) Enable fast switching for PBR. In Cisco IOSSoftware Release 12.0, PBR can be fast switched. Prior to Cisco IOS SoftwareRelease 12.0, PBR could only be processed switched.

In a process-switchedenvironment, the switching rate is approximately 1000 to 10,000 packets persecond. This speed was not considered fast enough for many applications.

You canenable fast switching of PBR with the following interfacecommand:router(config-if)# ip route-cachepolicyPBR must be configured before you configure fast-switchedPBR. Fast-switched PBR does not support the set ip default next-hopand set default interface commands. The setinterface command is supported over point-to-point links or with astatic route cache entry equal to the interface specified in the setinterface command.Step 7(Optional) Configure local PBR. Packets generated by therouter are not policy routed. If you want to policy route traffic generated bythe router, you must enable it. To enable local PBR, use the following globalconfiguration command.router(config)# ip local policyroute-map route-mapnamePractical Example: Configuring PBR and Setting ToSIn this section, you apply a couple of these concepts to a practical examplein policy routing.

For the network depicted in Figure 2-10, create a policyroute that will forward Telnet traffic to the earp router, 172.16.10.3, whilesetting the ToS bit to minimum delay. All other IP traffic will be forwarded tothe holliday router, 172.16.10.4.Policy-Based RoutingFollowing the multistep process for configuring PBR, Steps 1 through 3 callfor you to first configure the route map with the necessary match andset commands. The route map will call an ACL that matches Telnettraffic, and the set command will set the IP next hop to be the IPaddress of the earp router.

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Table 2-12 specifies that Telnet traffic should havethe ToS set to min-delay; therefore, the route map will set this bit forTelnet traffic in the ToS value to min-delay. Another route map instancewill be used to match all other traffic and forward it to the holliday router.Because the route map instance will match all traffic, there is no need toinclude a match command. Example 2-30 lists the route map configurationon the tombstone router to accomplish this.

Example 2-30 Route Map Configuration on the tombstone Router route-map policy2 permit 100match ip address 101 Call access-list 101set ip next-hop 172.16.10.3 Set the next hop to 172.16.10.3/earpset ip tos min-delay Set the TOS to min-delay!route-map policy2 permit 200set ip next-hop 172.16.10.4 Match all routes and set the next hopto 172.16.10.4/hollidayNow you must configure any ACLs the route map will need. In this case,configure a single ACL to match TCP telnet traffic from any IP address. The ACLyou will use resembles the following: access-list 101 permit tcp any any eq telnetThere is no need to write an ACL to catch all the regular traffic.

Asdiscussed earlier, the absence of a match statement, such as in thesecond route map instance, will match all routes or all packets.The last two steps call for you to apply the policy route to an interface andto enable fast switching for PBR. This is accomplished with the interfacecommands ip policy route-map and ip route-cache policy. In thismodel, you will enable PBR on the E0/1 interface of the tombstone router.

WithPBR enabled on the E0/1 interface, all Telnet traffic will be forwarded to theearp router, whereas all other IP traffic will be forwarded to the hollidayrouter. Example 2-31 lists the complete PBR configuration of the tombstonerouter.