Re: Why a transit area cannot be a stub area?

my thought was wiered .. i have labbed up and got clarified

here is what i did .. put all loopbacks in 4 different areas and different
processes

Router#show ip ospf int br
Interface PID Area IP Address/Mask Cost State Nbrs F/C
Lo2 4 4 2.2.2.2/32 1 LOOP 0/0
Lo4 3 3 4.4.4.4/32 1 LOOP 0/0
Lo3 2 2 3.3.3.3/32 1 LOOP 0/0
Lo1 1 0 1.1.1.1/32 1 LOOP 0/0
Router#
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Router(config)#router ospf 4
Router(config-router)#area 4 stub
Router(config-router)#
Router(config-router)#router ospf 3
Router(config-router)#area 3 nssa
Router(config-router)#
Router(config-router)#router ospf 2
Router(config-router)#area 2 nssa no
% Ambiguous command: "area 2 nssa no"
Router(config-router)#area 2 nssa no?
no-redistribution no-summary

Router(config-router)#area 2 nssa no-su
Router(config-router)#
Router(config-router)#router ospf 1
Router(config-router)#
Router(config-router)#area 0 ?
  authentication Enable authentication
  default-cost Set the summary default-cost of a NSSA/stub area
  filter-list Filter networks between OSPF areas
  nssa Specify a NSSA area
  range Summarize routes matching address/mask (border routers
only)
  sham-link Define a sham link and its parameters
  stub Specify a stub area
  virtual-link Define a virtual link and its parameters

Router(config-router)#area 0 stub
OSPF: Backbone can not be configured as stub area
Router(config-router)#
Router(config-router)#

-----------------

outer#show ip ospf da

            OSPF Router with ID (4.4.4.4) (Process ID 4)

                Router Link States (Area 4)

Link ID ADV Router Age Seq# Checksum Link count
4.4.4.4 4.4.4.4 168 0x80000001 0x000EFB 1

            OSPF Router with ID (3.3.3.3) (Process ID 3)

                Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
3.3.3.3 3.3.3.3 321 0x80000001 0x00B872 0

                Router Link States (Area 3)

Link ID ADV Router Age Seq# Checksum Link count
3.3.3.3 3.3.3.3 222 0x80000001 0x009E6B 1

            OSPF Router with ID (1.1.1.1) (Process ID 2)

                Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 640 0x80000001 0x0051E9 0

                Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 256 0x80000001 0x001509 1

            OSPF Router with ID (2.2.2.2) (Process ID 1)

                Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 169 0x80000003 0x00809B 1

                Router Link States (Area 1)

Link ID ADV Router Age Seq# Checksum Link count
2.2.2.2 2.2.2.2 169 0x80000006 0x00FA33 0
Router#

but i dint get why different process picked up different router-ids ..
ultimately all of the router-ids should be 4.4.4.4 right ?

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