Giáo Trình CIs+ part 87

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Giáo Trình CIs+ part 87

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Nội dung Text: Giáo Trình CIs+ part 87

  1. print "No\nTry redialing your ISP"; sleep(3); } $p->close(); #end listing ****************************************************************** ******** From: Question 32 Subject: How do I use tftpdnld via Ethernet port on a 2600? Press Ctrl+Break on the terminal keyboard within 60 seconds of the power-up to put the router into ROMMON. rommon 1 > IP_ADDRESS= rommon 2 > IP_SUBNET_MASK= rommon 3 > DEFAULT_GATEWAY= rommon 4 > TFTP_SERVER= rommon 5 > TFTP_FILE=/tftpboot/c2600-i-mz rommon 6 > tftpdnld ****************************************************************** ******** From: Question 33 Subject: How do I setup MultiLinkPPP? multilink PPP without virtual template int Multilink1 description multilink bundle ip unnumbered Loopback0 ppp multilink multilink-group 1 int Ser0 description first T1 line encaps ppp ppp multi multilink-group 1 int Ser1 description second T1 line encaps ppp ppp multi multilink-group 1 Again, recent software necessary: at least 12.0T or 12.1 or one of the ISP branches (12.0S).
  2. ****************************************************************** ******** From: Question 34 Subject: How much memory is taken up by BGP routes? As a reference, please see the following from I'd like to drill down another level to decide why each entry contains 240 bytes Tech Tip: How Much Memory Does Each BGP Route Consume? Each Border Gateway Protocol (BGP) entry takes about 240 bytes of memory in the BGP table and another 240 bytes in the IP routing table. Each BGP path takes about 110 bytes. ****************************************************************** ******** From: Question 35 Subject: How do I stop my router from looking for cisconet.cfg or network-config? Look up "service config" in the manual (available on if you do not have a local copy). Turn it off using the command "no service config" in configuration mode. ****************************************************************** ******** From: Question 36 Subject: How do I setup DHCP service on my router? Here is my 1601 performing as a DHCP server config... The static pool is how I use DHCP to assign the same IP to the same PCeach time, essentially a static IP address assignment. The only other requirement would be that on the interface DHCP requests will be received, if you have an inbound ACL, bootp must be permitted. ip dhcp excluded-address ip dhcp pool dhcp-pool network default-router netbios-node-type b-node dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee ip dhcp pool static-pool host client-identifier 0100.00c5.0cbd.7e client-name main_pc default-router dns-server aaa.bbb.ccc.ddd aaa.bbb.ccc.eee
  3. ****************************************************************** ******** From: Question 37 Subject: How do I configure a trasparent proxy redirecting on CISCO router? >It is possible to configure an trasparent proxy redirecting on CISCO router? >I would like to redirect all www requests from specific IP addresses to >other IP address and other port. A route-map does the IP redirection nicely, I've used it for http and smtp. Not sure about switching ports simultaneously with the same route map, but you could fix this with 'ipfw' or similar on the host. Be sure you have 'ip route-cache policy' enabled to save CPU on the interface. WCCP is another option. ****************************************************************** ******** From: Question 38 Subject: How do I use a route-map to limit redistribution in OSPF? /* match only 172.16.10.x and subnets */ access-list 1 permit /* use access-list 1 to determine what gets matched */ route-map LoopbacksOnly permit 10 match ip address 1 /* redistribute connected networks, any and all subnets, */ /* and seed it as E2 type. Note that throughout your */ /* OSPF domain, your loopbacks will have a metric of 20 */ /* 20 is the default metric when you redistribute into */ /* OSPF. Except for BGP routes which get a metric of 1. */ /* Also use the route-map LoopbacksOnly to selectively */ /* redistribute only the ones we want to redistribute. */ router ospf 200 redistribute connected subnets metric-type E2 route-map LooopbacksOnly ****************************************************************** ******** From: Question 39 Subject: How do I connect 675 DSL units back to back? Well I found out that you can hookup other DSL boxes back to is part of an email I found on it: you need: 'dsl equipment-type CO' on one side and 'dsl equipment-type CPE' on the other Here is a working example from the lab:
  4. (The distance limitation should be the same as the one found in the docs) also, you can run 'debug dsl-phy' a new command to look at the trainup. (CO side, an 828) interface ATM0 no ip address no atm ilmi-keepalive dsl equipment-type CO dsl operating-mode GSHDSL symmetric annex A dsl linerate AUTO interface ATM0.1 point-to-point ip address pvc 1/33 encapsulation aal5snap (CPE side, a SOHO78) interface ATM0 no ip address no atm ilmi-keepalive dsl equipment-type CPE dsl operating-mode GSHDSL symmetric annex A dsl linerate AUTO interface ATM0.1 point-to-point ip address pvc 1/33 encapsulation aal5snap ****************************************************************** ******** From: Question 40 Subject: Why can't I upload an IOS image on to my flash on my 2500 router? > i took one from another 2500, same label E28F008SA and unfortunalely, > same ERROR MESSAGE while issuing COPY TFTP FLASH from config-reg > 0x2101 The flash in your system is not recognized by the boot ROM. You can upgrade your boot ROM (Cisco part BOOT-2500=) or use flash that is compatible (Intel). ****************************************************************** ******** From: Question 41 Subject: How do I configure my router so it becomes a DHCP CLIENT? If you have 12.1(2)T or better and you need:
  5. C800, C100x, C1400, C160x, C17x0, C25xx, C26xx, C36xx, C4x00, C64xx, C7x00, C8500, and C12000 UBR900, UBR7200 MC3810 The interface command is "ip address dhcp" ****************************************************************** ******** From: Question 42 Subject: How do you setup a simple Priority Queuing? I would take a look at priority queuing, see the link below: /qos_c/qcprt2/qcdpq.htm A simple config for your case would be: priority-list 1 protocol ip high tcp telnet priority-list 1 default medium interface Ethernet1 ip address no ip directed-broadcast priority-group 1 ****************************************************************** ******** From: Question 43 Subject: What are the pro's and con's of using two ISP/BGP providers? >Why would you use BGP with 2 Internet T1 vs using equal cost >static routing? What's the pros and cons? Thank you. The answer in a nutshell is: It depends. If each T1 goes to a different ISP, then you must use BGP to have the same public address regardless of route taken. If each T1 goes to the same ISP and load sharing and ease of setup/management is more important than availability, then go with static routes. If the T1 links do not support end-to-end keepalives, go with BGP to avoid black holes. If the T1 links go to different POPs of the same ISP, use BGP and indicator routes to detect ISP segmentation. If the T1 links go to geographically diverse POPs, then BGP with full or local routes may improve routing efficiency. For more detail, see the blurb
  6. (for those reading this out of the archives at a future date, a more detailed version of this paper will be appearing as a White Paper on my web site, but it will not be there until late Summer). Chapter 8 of my book walks you through all the



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