H3C Technologies H3C SecPath F1000-E - Manual (Page 312)

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Figure 19 NSSA external LSA format
Network mask
Forwarding address
LS age
Linke state ID
Advertising router
Options 7
LS sequence number
LS checksum Length
Metric
External route tag
...
E TOS
0 7 15 31
Authentication
OSPF supports authentication on packets. Only packets that pass the authentication are received. If hello
packets cannot pass authentication, the corresponding neighbor relationship can be established.
The authentication type for interfaces attached to a single area must be identical. Authentication types
include non-authentication, plaintext authentication and MD5 ciphertext authentication. The
authentication password for interfaces attached to a network segment must be identical.
Configuing OSPF
Configuration Prerequisites
Before configuring OSPF, you need to configure the link layer protocol, and IP addresses for interfaces,
making neighboring nodes accessible with each other at the network layer.
Configuration Overview
An OSPF routing domain has different types of routers, such as intra-area routers, ABR, and ASBR. OSPF
can work normally only after being enabled on a router, regardless of the router’s type.
Network planning is needed before OSPF configuration on routers. The configurations for routers in an
area are performed on the area basis. Wrong configurations may cause communication failures, even
routing information block or routing loops between neighboring routers.
Perform the tasks in
Table 1 to configure OSPF.
Table 1 OSPF configuration task list
Task Remarks
Enable OSPF
Configuring OSPF
Globally
Required
Enable OSPF on all interfaces.