为了帮助大家更好的复习2014年思科考试科目,我们考吧.cc主要为大家汇编了以下辅导资料,希望考生们能够喜欢。想了解更多相关思科考试信息,我们考吧网会第一时间为大家奉上。
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(Network)
Link State ID: 34.1.1.0 (summary Network Number)
Advertising Router: 92.2.2.2
LS Seq Number: 80000004
Checksum: 0x4CE6
Length: 28
Network Mask: /24
TOS: 0 Metric: 128
有网络前缀,掩码,度量值
2类LSA一般在MA网络类型中出现,需要选举DR,传输范围也在一个区域内,不能跨区域ABR
R2 Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
100.1.1.3 93.3.3.3 4 0x80000001 0x00EEB2
R3 Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
100.1.1.3 93.3.3.3 55 0x80000001 0x00EEB2
呵呵,看到了吗?2类LSA的LSDB也是一样的。Link-id就是DR的物理接口IP地址。通告者的RID也是
DR的RID
宣告的也是纯拓扑信息,包含内容:show ip ospf database network
OSPF Router with ID (93.3.3.3) (Process ID 110)
Net Link States (Area 0)
Routing Bit Set on this LSA
LS age: 261
Options: (No TOS-capability, DC)
LS Type: Network Links
Link State ID: 100.1.1.3 (address of Designated Router)
Advertising Router: 93.3.3.3
LS Seq Number: 80000001
Checksum: 0xEEB2
Length: 32
Network Mask: /24
Attached Router: 93.3.3.3
Attached Router: 92.2.2.2
有网络掩码,直连的路由器ID
下面就是看看5类LSA 也就是外部LSA,需要将该拓扑中RIP路由宣告进OSPF进程中
R4:
router ospf 110
redistribute rip subnets
查看R1 show ip ospf database,看看多了什么?
OSPF Router with ID (91.1.1.1) (Process ID 110)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
91.1.1.1 91.1.1.1 1637 0x80000003 0x0058F8 3
92.2.2.2 92.2.2.2 1568 0x80000002 0x004D14 2
Summary Net Link States (Area 1)
推荐阅读: