[j-nsp] OSPF default in TSA

Harry Reynolds harry at juniper.net
Thu May 14 16:47:43 EDT 2009

Does rc2 have an area 0 adjacency up? If not I believe active backbone detection suppresses the default. Looks likes its area 0 lsdb is all self-populated.




-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of The Dark One
Sent: Thursday, May 14, 2009 1:24 PM
To: Juniper Puck
Subject: [j-nsp] OSPF default in TSA

according to JNCIP_studyguide pag 179:
"Juniper Networks routers do not automatically generate a default route when operating as an ABR attached to a stub or not-so-stubby area. With JUNOS software, you must configure a default metric before a default route will be advertised!"

But router 'itp' doesn't get it :-( any idea why and how?

rc2> show configuration routing-instances RI protocols ospf   
area {
    stub default-metric 1 no-summaries;
    interface ge-5/2/1.176;
area {
    interface ge-5/2/0.314;

rc2> show ospf database instance RI

    OSPF database, Area
 Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len 
Router  *   0x80000004   119  0x22 0x1813  36
Summary *   0x80000004   119  0x22 0x712a  28
Summary *   0x80000004   119  0x22 0x4248  28

    OSPF database, Area
 Type       ID               Adv Rtr           Seq      Age  Opt  Cksum  Len 
Router   0x80000006   266  0x20 0x8f14  48
Router  *   0x80000008   119  0x20 0xeed0  36
Network *   0x80000003   119  0x20 0x12db  32

lab at hu-bud01a-rc2> show ospf neighbor instance RI 
Address          Interface              State     ID               Pri  Dead   ge-5/2/1.176           Full     1    36


itp#show ip interface brief | ex una
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0    YES manual up                    up      
Loopback0          YES manual up                    up      

itp#show running-config | s router ospf
router ospf 1
 area stub
 network area itp#show ip route <....> Gateway of last resort is not set is variably subnetted, 2 subnets, 2 masks
C is directly connected, Loopback0
C is directly connected, FastEthernet0/0

itp#show ip ospf database 

            OSPF Router with ID ( (Process ID 1)

                Router Link States (Area

Link ID         ADV Router      Age         Seq#       Checksum Link count  424         0x80000006 0x008F14 2  278         0x80000008 0x00EED0 1

                Net Link States (Area

Link ID         ADV Router      Age         Seq#       Checksum  278         0x80000003 0x0012DB

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