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Hiding OSPFTransit-only Networks
Yi YangIETF 79
What are transit-only networks?
Why to hide them?
Infrastructure security
Plus, downsize routing table and speed up convergence
How to hide them?
Point-to-Point networks
Broadcast networks
Non-Broadcast networks
LS Age = 0LS Type = 1LS ID = 1.1.1.1Adv. Router = 1.1.1.1Number of Links = 2
Link ID = 2.2.2.2Link Data = 10.1.1.1Type = 1Metric = 10
Link ID= 10.1.1.0Link Data = 255.255.255.252Type = 3Metric = 10
Point-to-Point
10.1.1.0/30.1
1.1.1.1
.2
2.2.2.2
LS Age = 0LS Type = 1LS ID = 2.2.2.2Adv. Router = 2.2.2.2Number of Links = 2
Link ID = 1.1.1.1Link Data = 10.1.1.2Type = 1Metric = 10
Link ID= 10.1.1.0Link Data = 255.255.255.252Type = 3Metric = 10
LS Age = 0LS Type = 1LS ID = 1.1.1.1Adv. Router = 1.1.1.1Number of Links = 1
Link ID = 2.2.2.2Link Data = 10.1.1.1Type = 1Metric = 10
Point-to-Point
10.1.1.0/30.1
1.1.1.1
.2
2.2.2.2
LS Age = 0LS Type = 1LS ID = 2.2.2.2Adv. Router = 2.2.2.2Number of Links = 1
Link ID = 1.1.1.1Link Data = 10.1.1.2Type = 1Metric = 10
Broadcast
10.2.2.0/24
.3
3.3.3.3
.4
4.4.4.4
.5
5.5.5.5
LS Age = 0LS Type = 2LS ID = 10.2.2.5Adv. Router = 5.5.5.5Network Mask = 255.255.255.0Attached Router = 3.3.3.3Attached Router = 4.4.4.4Attached Router = 5.5.5.5
Broadcast
10.2.2.0/24
.3
3.3.3.3
.4
4.4.4.4
.5
5.5.5.5
LS Age = 0LS Type = 2LS ID = 10.2.2.5Adv. Router = 5.5.5.5Network Mask = 255.255.255.255Attached Router = 3.3.3.3Attached Router = 4.4.4.4Attached Router = 5.5.5.5
Non-Broadcast: NBMA
Use /32 subnet mask, similar to Broadcast
Non-Broadcast: P2MP
10.3.3.0/24
.6
6.6.6.6
.7
7.7.7.7
.8
8.8.8.8
LS Age = 0LS Type = 1LS ID = 6.6.6.6Adv. Router = 6.6.6.6Number of Links = 3
Link ID = 7.7.7.7Link Data = 10.3.3.6Type = 1Metric = 10
Link ID = 7.7.7.7Link Data = 10.3.3.6Type = 1Metric = 10
Link ID= 10.3.3.0Link Data = 255.255.255.0Type = 3Metric = 0
Non-Broadcast: P2MP
10.3.3.0/24
.6
6.6.6.6
.7
7.7.7.7
.8
8.8.8.8
LS Age = 0LS Type = 1LS ID = 6.6.6.6Adv. Router = 6.6.6.6Number of Links = 2
Link ID = 7.7.7.7Link Data = 10.3.3.6Type = 1Metric = 10
Link ID = 7.7.7.7Link Data = 10.3.3.6Type = 1Metric = 10
OSPFv3
Remove IPv6 Prefixes from the intra-area-prefix-LSAs
Next Step
END
Backward Compatibility: Broadcast
10.2.2.0/24
.3
3.3.3.3
.4
4.4.4.4
.5
5.5.5.5
LS Age = 0LS Type = 2LS ID = 10.2.2.5Adv. Router = 5.5.5.5Network Mask = 255.255.255.255Attached Router = 3.3.3.3Attached Router = 4.4.4.4Attached Router = 5.5.5.5
Backward Compatibility: Broadcast
10.2.2.0/24
.3
3.3.3.3
.4
4.4.4.4
.5
5.5.5.51.1.1.1
7.7.7.7 8.8.8.8
Host B
Host A2.2.2.2
Upgraded Not-upgraded-yet
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