Answers to Chapter 9 Configuration Exercises

1:	Configure a router to accept polls from management stations 172.16.1.2 and 172.16.1.3 only. Do not allow write access to the stations. Allow the stations to read information about the SNMP MIB II interface entries only. Allow station 172.16.1.4 to read any MIB variable and allow it to load and save configuration files via SNMP. Send logging information at the Notification level, via SNMP, to 172.16.1.4.
A:	[click here] access-list 1 permit 172.16.1.2 0.0.0.1 access-list 2 permit 172.16.1.4 snmp-server view interface_entries ifEntry included snmp-server community anystring view interface_entries RO 1 snmp-server community restricted RO 2 snmp-server tftp-server-list 2 snmp-server enable traps syslog logging history notification
2:	Configure the router to send an SNMP trap to 172.16.1.4 when the 5-minute average CPU exceeds 90%. Send the trap whenever the CPU goes from below 85% to above 90% in any 60-second interval.
A:	[click here] snmp-server community eventtrap RO snmp-server enable traps snmp-server host 172.16.1.4 eventtrap rmon event 1 trap eventtrap description "High 5-minute CPU" owner smith rmon alarm 10 lsystem.58.0 60 absolute rising-threshold 90 1 falling-threshold 85 owner smith
3:	Configure a router to use NTP to update its own time and date based on clock information from router 172.16.100.100. Do not allow the other router to update its clock based on information from your router.
A:	[click here] ntp server 172.16.100.100
4:	Configure a NetFlow aggregation cache, grouping data based on the source and destination prefix. Use the peer AS in the data, and export the data to 172.16.1.4.
A:	[click here] ip cef ! ip flow-export version 5 peer-as ip flow-export destination 172.16.1.4 125 ip flow-aggregation cache prefix cache entries 2046 cache timeout inactive 200 cache timeout active 45 export destination 172.16.1.4 9991 enabled !
5:	Configure two routers on an Ethernet segment to provide backup for each other. Router A is primary, and router B takes over when A fails. When A recovers, it becomes the primary router again. Router A has two serial links, serial 0 and serial 1, that forward traffic to various destinations. If either link fails, router B takes over as the primary router.
A:	[click here] Router A interface Ethernet 0 ip address 172.16.1.100 255.255.255.0 standby 1 priority 120 preempt standby 1 ip 172.16.1.201 standby 1 track Serial0 25 standby 1 track Serial1 25 __________________________________________________________________ Router B interface Ethernet 0 ip address 172.16.1.101 255.255.255.0 standby 1 ip standby 1 priority 100 preempt