7 Review PC+ () 1+PHS etc!! SOI!! Topics () IP () / L3 IP YMH RTX-1500 BUFFLO BHR-4RV PLNEX GW-P54SG Cisco 2600 Hitachi GR2000-1B Cisco 3700 Juniper M10 Foundry Networks NetIron 800 Cisco CRS-1 (FIB: Forwarding Information Base) next hop () : 203.178.143.0/24 1
IP Forwarding prefix Next-hop 10.0.0.0/24 172.16.0.0/24 C B C 10.0.0.0/24 172.16.0.0/24 - - 10.0.0.0/24 192.168.0.0/24 172.16.0.0/24 Source: http://www.ekitan.com/ - - : IPv4 RTT/ : WIDE US/Europebilene ISPIX UUNET/KDDI NSPIXP3 () WIDE () WIDE () KEIO WIDE () WIDE () PN DIX-IE () 2 bilene KDDI UUNet Commercial cademic cisco1.fujisawa#show ip route Codes: B - BGP, O - OSPF, I - OSPF inter area N1 - OSPF NSS external type 1, N2 - OSPF NSS external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 B 192.68.132.0/24 [200/0] via 203.178.136.20, 1w2d B 193.16.208.0/24 [200/14639] via 203.178.136.15, 3d08h 170.171.0.0/16 is variably subnetted, 2 subnets, 2 masks B 170.171.1.0/24 [200/9420] via 203.178.136.15, 1w3d B 170.171.0.0/20 [200/9420] via 203.178.136.15, 1w3d O E1 206.117.185.0/24 [110/19102] via 203.178.138.241, 01:36:05, GigabitEthernet2/0.4 B 203.87.158.0/24 [200/0] via 203.178.136.15, 2d04h B 202.169.96.0/24 [200/0] via 203.178.136.15, 5d16h B 210.23.195.0/24 [200/0] via 203.178.136.15, 1d06h B 209.249.46.0/24 [200/5523] via 203.178.136.15, 1w3d O E1 202.249.53.0/24 [110/10112] via 203.178.138.227, 01:36:09, Next-Hop GigabitEthernet2/0.4 B 192.68.132.0/24 [200/0] via 203.178.136.20, 1w2d : IPv4 cisco1.fujisawa#show ip cef Prefix Next Hop Interface 133.23.0.0/16 203.178.138.231 GigabitEthernet2/0.4 133.24.0.0/16 203.178.138.231 GigabitEthernet2/0.4 133.25.0.0/16 203.178.138.231 GigabitEthernet2/0.4 133.26.0.0/16 203.178.138.231 GigabitEthernet2/0.4 133.27.0.0/16 203.178.137.78 GigabitEthernet1/0.100 133.27.1.240/29 attached GigabitEthernet1/0.120 133.27.1.240/32 receive 133.27.1.241/32 133.27.1.241 GigabitEthernet1/0.120 133.27.1.242/32 133.27.1.242 GigabitEthernet1/0.120 133.27.1.243/32 133.27.1.243 GigabitEthernet1/0.120 133.27.1.244/32 133.27.1.244 GigabitEthernet1/0.120 133.27.1.245/32 133.27.1.245 GigabitEthernet1/0.120 133.27.1.246/32 receive 133.27.1.247/32 receive 133.28.0.0/16 203.178.138.231 Next-Hop GigabitEthernet2/0.4 133.29.0.0/16 203.178.138.231 GigabitEthernet2/0.4 133.27.0.0/16 203.178.137.78 GigabitEthernet1/0.100 (Longest Match) IPmatch Default route(0.0.0.0/0 IP 131 113 209 140 1 2 1 0 0 0 0 0 1 1 0 1 1 1 0 0 0 1 1 1 0 1 0 0 0 1 1 0 0 0 1 1 0 0 131 113 209 0/24 1 0 0 0 0 0 1 1 0 1 1 1 0 0 0 1 1 1 0 1 0 0 0 1 0 0 0 0 0 0 0 0 24bit 131 113 209 128/28 1 0 0 0 0 0 1 1 0 1 1 1 0 0 0 1 1 1 0 1 0 0 0 1 1 0 0 0 1 0 0 0 28bit 2
Default Route IP default route IP next-hop (Static Routing) 10.0.0.1() Prefix 0.0.0.0/0 Next-hop Next-hop 10.0.0.3 10.0.0.3 10.0.0.1 Next-hop 10.0.0.1 (Dynamic Routing) vs (Routing Protocol) 10.0.0.1() Prefix 0.0.0.0/0 0.0.0.0/0 Next-hop 10.0.0.3 Next-hop 10.0.0.3 10.0.0.3 10.0.0.1 Next-hop 10.0.0.1 Next-hop RIP, OSPF, IS-IS, EIGRP, BGP () RIP OSPF 3
: RIPv1, RIPv2 /L3 9.6Kbps () (1/4) Net (2/4) Net 2 hop 1 hop D 133.27.5.0/24 1 hop 2 hop D 133.27.5.0/24 (3/4) Net (4/4) Net 1 hop 2 hop 2 hop 3 hop D 133.27.5.0/24 1 hop 2 hop D 133.27.5.0/24 4
OSPF (Open Shortest Path First) IS-IS (Integrated System to Integrated System) Loop Free,L3 () : R1R2 : R1 flooding () B 30 UP/DOWN 30 Net 30 30 30 30 100 100 30 D 133.27.5.0/24 flooding To:, To: B, To: B, To: D, Cost: 100 To: B, To: B, Cost: 500 C D To: D, To: C, B Net Cost 30 Cost 30 Cost 100 () D C Cost 60 Neighbor RIP L3 30 OSPF IPIB (DR/BDR) 10 (Hello) () IS-IS OSI CLNP 10 (IS-IS Hello) EIGRP Cisco 5 (1.5Mbps 60),,,, MTU 5
dministrative Distance (1/2) : Prefix Next-hop Output Interface RIPv2 OSPF EIGRP 10.0.0.0/8 172.18.2.41 192.168.3.1 FastEthernet0/2 GigabitEthernet0/1 Serial0/0 dministrative Distance (2/2) dministrative Distance Preference dministrative Distance : Connected () Static EBGP OSPF RIP Cisco, Foundry, Juniper 0 1 20 110 120 Hitach (gated) 0 20 170 10 100 (utonomous System) (utonomous System) 1 ISP1 JPNIC http://www.nic.ad.jp/ja/ip/asnumber.html KDDI 2516 So-Net 2527 IIJ 2497 OCN 4713 WIDE 2500 RIPOSPF (RIP, OSPF) (BGP) (RIP, OSPF) 203.178.143.3 BGP B B B 203.178.143.0/2 5 () X BGP RIP, OSPF 203.178.143.0/24 203.178.143.128/ 25 C (B) 203.178.143.0/25 203.178.143.128/25 6
C B D E EGPIGP EGP(Exterior Gateway Protocol) BGP4 IGP(Interior Gateway Protocol) RIP, OSPF, IS-IS BGP () 1 1 2 B B C 3 CB D 2 D 4 E D CB BGP (Border Gateway Protocol) ISP External Etc BGP () 2516 7660 2500 4717 4767 TTL Next-hop is 10.0.0.3 10.0.0.3 10.0.0.1 Next-hop is 10.0.0.1 Next-hop is traceroute to 10.1.2.3, 30 hops max, 38 byte packets 1 10.0.0.3 8.875 ms 8.753 ms 9.691 ms 2 10.0.0.1 9.564 ms 11.345 ms 14.346 ms 3 8.693 ms 8.758 ms 8.631 ms 4 10.0.0.3 8.622 ms 8.802 ms 8.728 ms 5 10.0.0.1 10.011 ms 12.782 ms 10.113 ms 6 10.007 ms 10.627 ms 10.049 ms 7
BB B C BB B B B C D D BB B BB B C!!LOOP!! DCB C CB CB D D BGP telnet@foundry1.fujisawa#show ip bgp route Total number of BGP Routes: 91216 Status :GGREGTE B:BEST b:not-instlled-best C:CONFED_EBGP D:DMPED E:EBGP H:HISTORY I:IBGP L:LOCL M:MULTIPTH S:SUPPRESSED Prefix Next Hop Metric LocPrf Weight Status 1 4.78.32.0/21 203.178.136.15 9041 100 0 BI _PTH: 6461 14361 29748 2 4.78.32.0/21 203.178.136.15 9041 100 0 I _PTH: 6461 14361 29748 3 4.78.32.0/21 203.178.136.15 9041 100 0 I _PTH: 6461 14361 29748 4 4.78.32.0/21 203.178.136.15 9041 100 0 I _PTH: 6461 14361 29748 5 6.1.0.0/16 203.178.136.15 100 100 0 BI _PTH: 7660 11537 668 1455 IX( exchange) IX IX 8
Punching hole ISP () /24 IPISP ISP Punching Hole 203.178.136.0/21 JPNIC 203.178.143.0/24 ISP X 203.178.143.0/24 203.178.136.0/21 ISP B ISP 203.178.143.0/24 (1/2) (ISP) (ISP) () 1 2 1 (ISP) 2 (ISP) () () () () 1 2 (ISP) BGP () BGP OSPFRIP (ISP) BGP () BGP OSPFRIP 9
(2/2) ISP () () (ISP) () (ISP) () () BGP () B C BGP BGP _PTH MED(Multi Exit Discriminator) Local Preference (1/3) RIP, OSPF, BGP, etc dministrative Distance (2/3) RIP OSPFRIP OSPF RIPOSPF 10
(3/3) BGP 11