CCNP Route CCNP Route
From Datateknik
intro
Contents |
Administrative distance
Administrative Protocol distance Directly connected route 0 Static route out an interface 1 Static route to next-hop address 1 EIGRP summary route ............ 5 External BGP 20 Internal EIGRP ................ 90 IGRP 100 OSPF .......................... 110 IS-IS 115 RIP 120 ODR 160 External EIGRP ................ 170 Internal BGP 200 Unknown 255
Tricks
Remove * in 'traceroute'
If you get stars in traceroute like below
R1# traceroute 10.0.34.4 1 10.0.12.2 16 msec 8 msec 12 msec 2 10.0.23.3 16 msec 16 msec 16 msec 3 10.0.34.4 16 msec * 20 msec
Look at the rate-limit of icmp: show ip icmp rate-limit
!! the 'show/clear ip icmp' commands are in the R4# show ip icmp rate-limit !! 12.4(2)T train, not the 12.4 mainline train. :)
DF bit unreachables All other unreachables Interval (millisecond) 500 500 Interface # DF bit unreachables # All other unreachables FastEthernet0/1 0 3
Change (or remove) the rate-limit of icmp
ip icmp rate-limit 2000 ! no ip icmp rate-limit unreachable
Source: http://packetlife.net/blog/2008/dec/29/traceroute-timeouts/
This limitation is for the aggregate rate of all the ICMP unreachables, as this output shows. More info in RFC 792.
type = 3, code
0 = net unreachable;
1 = host unreachable;
2 = protocol unreachable;
3 = port unreachable;
4 = fragmentation needed and DF set;
5 = source route failed.
Robert: fixa route-filter i CNAP / OSPF
router ospf 1 log-adjacency-changes area 13 filter-list prefix FORWARD-PREFIXES out network 192.168.31.0 0.0.0.127 area 13 network 0.0.0.0 255.255.255.255 area 0 distribute-list route-map LOVELY-ROUTERS-N-ROUTES in ! ! ip route-map LOVELY-ROUTERS-N-ROUTES permit 10 match ip route-source LOVELY-ROUTERS ip route-map LOVELY-ROUTERS-N-ROUTES permit 20 match ip address STUDENT-NETS ip route-map LOVELY-ROUTERS-N-ROUTES deny 30 ! ! ip prefix-list FORWARD-PREFIXES seq 5 remark *** What routes to send to Mats/hv.se ip prefix-list FORWARD-PREFIXES seq 10 remark Allow the student network - exactly ip prefix-list FORWARD-PREFIXES seq 15 permit 193.10.203.128/25 ge 25 le 25 ip prefix-list FORWARD-PREFIXES seq 25 remark Allow all student-added nets w. mask >=28 ip prefix-list FORWARD-PREFIXES seq 25 permit 192.168.31.000/28 ge 28 ! ip access-list standard LOVELY-ROUTERS remark *** Which OSPF-speakers are allowed in the routing-table permit ip host 10.1.1.1 permit ip host 10.2.2.2 ! ip access-list extended STUDENT-NETS remark *** Which trusted student-nets to add to routing-table remark allow our student-network - exactly permit ip host 193.10.203.128 host 255.255.255.128 remark allow all student-added networks permit ip 192.168.31.0 0.0.0.63 255.255.255.255 0.0.0.63 ! ! !
Källa1: http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/routmap.html OSPF Inbound Filtering Using Route Maps with a Distribute List
Källa2: http://www.cisco.com/en/US/docs/ios/12_2t/12_2t4/feature/guide/ftabrt3f.html OSPF ABR Type 3 LSA Filtering
