Protocols
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[MPLS] OSPF Super Backbone Area (2)Protocols/BGP_OSPF_MPLS_VPN 2021. 6. 23. 17:24
1. Super Backbone Area와 동시에 Area 0는 없애기. (Area0는 2개 이상은 Area가 있는 경우 반드시 있어야 함) 2. Area 0가 없는데 OSPF 정상작동 가능한가? R1 - R4 는 Area 1, R2 - R5 는 Area 2, R3 - R6 은 Area 3 R1, R2, R3은 Super Backbone Area에 속한 라우터 R4는 Area 1에 속해 있으며, 1.1.5.5와 1.1.6.6으로 Ping 가능 R4는 1.1.5.5, 1.1.6.6 모두 LSA type 3으로 광고받고 있음 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 3..
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[MPLS] OSPF Super Backbone Area (1)Protocols/BGP_OSPF_MPLS_VPN 2021. 6. 23. 13:25
1. OSPF의 VRF는 어떻게 사용하는가 2. SuperBackbone Area의 존재, 어떻게 작동하는지 확인 Service Provider - EIGRP > LDP > MP-BGP(vpnv4), OSPF area 0 with CE Company1 - OSPF area 0 EIGRP와 RIP, BGP는 각 고객별 VRF를 각 해당 라우팅 프로세스 안에서 사용한다. router bgp 1 address-family ipv4 vrf company1 // bgp 1 프로세스 안에서 구별되는 고객별 VRF. redistribute ospf 1 match internal external 1 external 2 exit-address-family 하지만 OSPF는 하나의 Processor가 하나의 고객별 VRF..
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[MPLS] IP/MPLS BasicsProtocols/BGP_OSPF_MPLS_VPN 2021. 6. 8. 16:19
1. OSPF Topology 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 R1#show run | b router ospf 1 router ospf 1 router-id 1.1.1.1 network 1.1.1.1 0.0.0.0 area 0 network 1.1.12.1 0.0.0.0 area 0 network 1.1.14.1 0.0.0.0 area 0 R2#show run | b router ospf 1 router ospf 1 router-id 1.1.2.2 network 1.1.2.2 0.0.0.0 area 0 network 1.1.12.2 0.0.0.0 area 0 network 1.1.23.2 0.0.0.0 ar..
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OSPF metric/costProtocols/BGP_OSPF_MPLS_VPN 2021. 2. 16. 23:20
Why 31 cost for R5 on R1? R1#show ip route ospf Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - ..
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OSPF Link-state/Adjacency changesProtocols/BGP_OSPF_MPLS_VPN 2021. 2. 16. 16:46
OSPF has a link-state with neighbors. each state from Down to Full is changed with packets establishing a neighbor. if your OSPF neighbor does not come up to FULL state, you can make the troubleshooting closer by looking for the stuck state. 1. Shutdown each interface on R1, R2, R3 R1(config)#int e 0/0.123 R1(config-subif)#sh R2(config)#int e 0/0.123 R2(config-subif)#sh R3(config)#int e 0/0.123 ..
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The OSPF Packet Types and FlowProtocols/BGP_OSPF_MPLS_VPN 2021. 2. 11. 14:02
Packet Name Type / number Function Hello 1 - Discovering neighbors - Maintaining neighbors Database Description 2 - Summarizing database contents Link state request 3 - Requesting LSAs (detailed DB) Link state update 4 - Updating DB Link state acknowledgment 5 - ACK I got these packet flow after commanding 'clear IP ospf process' on R5 R5#clear ip ospf process Reset ALL OSPF processes? [no]: yes..
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Building OSPF network with EVE-NG (2)Protocols/BGP_OSPF_MPLS_VPN 2021. 2. 11. 00:10
all OPSF nodes are in a specific 'area'. Area 0 is a backbone area. the backbone area is responsible for distributing routing information between non-backbone areas. if you have Area more than one, you should have backbone area. the backbone area should be 0 or 0.0.0.0 (0.0.0.0 is same with 0). you can use the decimal number or IP address format for Area number. R1(config)#router ospf 1 // this ..
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Building OSPF network with EVE-NG (1)Protocols/BGP_OSPF_MPLS_VPN 2021. 2. 9. 18:26
OSPF(Open Shortest Path First) is a link-state routing protocol. OSPF version 2 is for IPv4 and version 3 is for IPv6. OSPF protocol is illustrated from RFC2328. Why OSPF? It is a standard protocol unlike EIGRP(Cisco). almost all network devices support OSPF for a routing protocol. Why no OSPF? OSPF could consume resources such as CPU and RAM but nowadays devices are high-performance so it is no..