Is another router sending out the same summary? At 07:26 PM 7/23/2002 +0000, Stephane LITKOWSKI wrote: >Some more informations : > >LSA for 0.0.0.0 (using summary-address) : > >CustomerA#sh ip ospf database external > > OSPF Router with ID (192.168.254.254) (Process ID 1) > > > Type-5 AS External Link States > > LS age: 5 > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 0.0.0.0 (External Network Number ) > Advertising Router: 192.168.254.254 > LS Seq Number: 80000001 > Checksum: 0x2A22 > Length: 36 > Network Mask: /0 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 1 > Forward Address: 0.0.0.0 > External Route Tag: 0 > >CustomerA#sh ip ospf database external > > OSPF Router with ID (192.168.254.254) (Process ID 1) > > > Type-5 AS External Link States > > Delete flag is set for this LSA > LS age: MAXAGE(3600) > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 0.0.0.0 (External Network Number ) > Advertising Router: 192.168.254.254 > LS Seq Number: 80000002 > Checksum: 0x301B > Length: 36 > Network Mask: /0 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 16777215 > Forward Address: 0.0.0.0 > External Route Tag: 1 > > > >LSA for 4.0.0.0 & 8.0.0.0 summary routes : > > >CustomerA#sh ip ospf database external > > OSPF Router with ID (192.168.254.254) (Process ID 1) > > > Type-5 AS External Link States > > LS age: 11 > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 4.0.0.0 (External Network Number ) > Advertising Router: 192.168.254.254 > LS Seq Number: 80000001 > Checksum: 0xEC5E > Length: 36 > Network Mask: /6 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 1 > Forward Address: 0.0.0.0 > External Route Tag: 0 > > LS age: 11 > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 8.0.0.0 (External Network Number ) > Advertising Router: 192.168.254.254 > LS Seq Number: 80000002 > Checksum: 0xAA9F > Length: 36 > Network Mask: /5 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 1 > Forward Address: 0.0.0.0 > External Route Tag: 0 > > >LSA 0.0.0.0 using default-originate command -> works fine > >CustomerA#sh ip ospf database external > > OSPF Router with ID (192.168.254.254) (Process ID 1) > > > Type-5 AS External Link States > > LS age: 13 > Options: (No TOS-capability, DC) > LS Type: AS External Link > Link State ID: 0.0.0.0 (External Network Number ) > Advertising Router: 192.168.254.254 > LS Seq Number: 80000001 > Checksum: 0x3C0F > Length: 36 > Network Mask: /0 > Metric Type: 2 (Larger than any link state path) > TOS: 0 > Metric: 1 > Forward Address: 0.0.0.0 > External Route Tag: 1 > >So there's no difference, I just saw that using summary-address, the LSA >0.0.0.0 as an external route tag set to 0 and set to 1 when it is aged out. >I done the same test using a cisco 2500 router with IOS 12.2, and it's the >same, LSA is prematurely aged out when using summary-address command. > >Thanks for the help. > > >Stephane > > > >""Stephane LITKOWSKI"" a icrit dans le message de news: >[EMAIL PROTECTED] > > 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]
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