TSA
Friday, November 14, 2008
TSA - TOTALLY STUBBY AREA : A TOTALLY STUBBY AREA ABR ONLY INJECTS THE DEFAULT ROUTE INTO THE AREA . THE TOTALLY STUBBY AREA IS A CISCO PROPIETARY
lets get down to configuration ..
****unlike the previous one .. this can be and should be done on abr
remember .... no specific command ..just include no summary
CODE
r2(config)#router ospf 1
r2(config-router)#area 23 stub no-
r2(config-router)#area 23 stub no-summary
r2(config-router)#
r2(config-router)#area 23 stub no-
r2(config-router)#area 23 stub no-summary
r2(config-router)#
see this routing table
CODE
r3#sir
Codes: 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, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.1.23.1 to network 0.0.0.0
172.20.0.0/24 is subnetted, 1 subnets
C 172.20.200.0 is directly connected, Loopback20
10.0.0.0/24 is subnetted, 3 subnets
C 10.1.3.0 is directly connected, Loopback3
O 10.1.2.0 [110/65] via 10.1.23.1, 00:06:10, Serial2/1
C 10.1.23.0 is directly connected, Serial2/1
O*IA 0.0.0.0/0 [110/65] via 10.1.23.1, 00:00:44, Serial2/1
r3#
Codes: 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, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 10.1.23.1 to network 0.0.0.0
172.20.0.0/24 is subnetted, 1 subnets
C 172.20.200.0 is directly connected, Loopback20
10.0.0.0/24 is subnetted, 3 subnets
C 10.1.3.0 is directly connected, Loopback3
O 10.1.2.0 [110/65] via 10.1.23.1, 00:06:10, Serial2/1
C 10.1.23.0 is directly connected, Serial2/1
O*IA 0.0.0.0/0 [110/65] via 10.1.23.1, 00:00:44, Serial2/1
r3#
no ia routes ...as specified in the definition..
CODE
r2#siodOSPF Router with ID (10.1.2.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.1.1.1 10.1.1.1 171 0x80000008 0x004EDA 3
10.1.2.1 10.1.2.1 1090 0x80000007 0x007CC7 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.2.0 10.1.2.1 1095 0x80000003 0x0074AA
10.1.3.0 10.1.2.1 407 0x80000001 0x00EFEF
10.1.23.0 10.1.2.1 1095 0x80000003 0x0005C5
Router Link States (Area 23)
Link ID ADV Router Age Seq# Checksum Link count
10.1.2.1 10.1.2.1 413 0x8000000A 0x00662C 3
172.20.200.1 172.20.200.1 414 0x8000000B 0x008F84 3
Summary Net Link States (Area 23)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 10.1.2.1 87 0x80000002 0x0039F5 --------------------------->********** compare with previous table
r2#