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:
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