Stephane, Looks like you are using the wrong command to achieve the desired result... you use 'summary-address' to define routes you want to 'summarize' for redistribution - it has nothing to do with a default gateway address. 'default-information-orginate' is the command you want to use to push out a default gateway into ospf for what you are trying to achieve.
HTH, Mark. -----Original Message----- From: Stephane LITKOWSKI [mailto:[EMAIL PROTECTED]] Sent: Wednesday, 24 July 2002 04:15 To: [EMAIL PROTECTED] Subject: OSPF summarizing BGP redistributed routes into 0/0 [7:49461] Hi all, I tried to use the "summary-address" OSPF command to summarize learned BGP routes to a default summary route (0/0) and it seems that it doesn't work. (fake BGP routes) ----- router A ------------ 1.0.0.0/32 (OSPF) --------- router B Router A : -------------- router ospf 1 log-adjacency-changes summary-address 0.0.0.0 0.0.0.0 redistribute bgp 1 subnets network 1.0.0.0 0.255.255.255 area 0 ! router bgp 1 bgp log-neighbor-changes network 5.0.0.0 network 6.0.0.0 network 7.0.0.0 network 8.0.0.0 network 9.0.0.0 network 10.0.0.0 ! ip classless ip route 5.0.0.0 255.0.0.0 Null0 ip route 6.0.0.0 255.0.0.0 Null0 ip route 7.0.0.0 255.0.0.0 Null0 ip route 8.0.0.0 255.0.0.0 Null0 ip route 9.0.0.0 255.0.0.0 Null0 ip route 10.0.0.0 255.0.0.0 FastEthernet0 Router B : -------------- router ospf 1 log-adjacency-changes network 1.0.0.0 0.255.255.255 area 0 On the router A, I can see that type 5 LSA is installed for 0/0 and propagated to neighbor : CustomerA#sh ip ospf database OSPF Router with ID (192.168.254.254) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 192.168.108.4 192.168.108.4 592 0x80000003 0x6121 2 192.168.254.254 192.168.254.254 592 0x80000006 0x7C72 2 Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 0.0.0.0 192.168.254.254 4 0x80000001 0x2A22 0 But after some seconds, the external LSA is aged out and so disappears (by what ????) : CustomerA#sh ip ospf database OSPF Router with ID (192.168.254.254) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 192.168.108.4 192.168.108.4 593 0x80000003 0x6121 2 192.168.254.254 192.168.254.254 593 0x80000006 0x7C72 2 Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 0.0.0.0 192.168.254.254 3600 0x80000002 0x301B 1 CustomerA#sh ip ospf database OSPF Router with ID (192.168.254.254) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 192.168.108.4 192.168.108.4 597 0x80000003 0x6121 2 192.168.254.254 192.168.254.254 596 0x80000006 0x7C72 2 If I use another summary-address (like 4.0.0.0/6 or 8.0.0.0/5), it works fine (external LSAs are not aged out). Why this use doesn't work ? What happens ? Why the LSA is aged out ? The purpose of this test was to conditionnaly advertise default routes (if BGP routes disappears, default route disappears). NB : router A is 1750 router with IOS 12.1(14) Thanks for help, -- Stephane LITKOWSKI Student in a French computer science school EPITA Telecom & Network specialization CCNA + CCNP EMail : [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=49482&t=49482 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]