01-19-2012 02:58 PM - edited 03-07-2019 04:27 AM
I have a strange problem. Here is my topology:
I have a L3 switch with several VLANs: 10.1.1.1/24, 10.1.2.1/24 10.1.3.1/24
I have a Router with its g0 connected to the switch on 10.1.1.1/24 . The router's g1 is connected to another network.
I'm running OSPF AND EIGRP between the switch and the router. I am redistributing OSPF into EIGRP and vice versa on the router.
When I do a "sh ip ospf database" on the switch, the 10.1.2.1/24 and the 10.1.3.1/24 shows up as LSA type 5s. Shouldn't these links show up as type 1 (router link states)?
Solved! Go to Solution.
01-19-2012 03:49 PM
Hello,
They are there but they are included in the type 1 LSA from the advertising router. Each router creates a type 1 LSA for itself. The LSA describes the router, its interfaces in that area and a list of neighboring routers on each interface. If you look again LSA with link id of 10.41.101.103 has a link count of 8. The type 5 is there because of the redistribution statement.
Also may I ask why are running two IGPs between the devices and redistributing between the protocols?
One more comment. Without a metric associated with your redistribute ospf 1 statement, EIGRP will not redistribute the OSPF routes. OSPF I believe applies a default metric of 20 and that's why you see the type 5 LSAs. CAUTION: Are you redistributing like this anywhere else in the network. Without the proper configuration the possibility of routing loops, suboptimal routing, etc could occur and I afraid that this misconfiguration has prevented such scenario from happening.
Regards,
Ryan
01-19-2012 03:00 PM
Vincent
You have not provided enough information for us to give you good answers. Please post the OSPF configuration, the interface configuration, and the output of show ip ospf interface.
HTH
Rick
01-19-2012 03:08 PM
I'm sorry. You'll have to disregard the IP addresses I used in the original post. I used those for the sake of brevity. As you can see from the 'sh ip ospf data' output, the connected networks on the switch show up as type 5 externals.
Here is my config from the switch:
interface Vlan120
ip address 10.41.120.1 255.255.255.0
no ip redirects
ip ospf message-digest-key 1 md5 7 xxxxx
end
router eigrp 1
network 10.41.1.0 0.0.0.255
network 10.41.61.0 0.0.0.255
network 10.41.101.103 0.0.0.0
network 10.41.102.0 0.0.0.255
network 10.41.111.0 0.0.0.255
network 10.41.112.0 0.0.0.255
network 10.41.117.0 0.0.0.255
network 10.41.120.0 0.0.0.255
eigrp stub connected summary
!
router ospf 1
area 0 authentication message-digest
network 10.41.1.0 0.0.0.255 area 0
network 10.41.61.0 0.0.0.255 area 0
network 10.41.101.103 0.0.0.0 area 0
network 10.41.102.0 0.0.0.255 area 0
network 10.41.111.0 0.0.0.255 area 0
network 10.41.112.0 0.0.0.255 area 0
network 10.41.117.0 0.0.0.255 area 0
network 10.41.120.0 0.0.0.255 area 0
!
Here is my config from the router:
interface GigabitEthernet0/0
description to switch
ip address 10.41.120.2 255.255.255.0
ip ospf message-digest-key 1 md5 7 xxxxx
end
router eigrp 1
redistribute static
redistribute ospf 1
network 10.41.101.1 0.0.0.0
network 10.41.120.0 0.0.0.255
network 192.168.41.0
no auto-summary
!
router ospf 1
log-adjacency-changes
area 0 authentication message-digest
redistribute static subnets
redistribute eigrp 1 subnets
network 10.41.101.1 0.0.0.0 area 0
network 10.41.120.2 0.0.0.0 area 0
network 192.168.41.41 0.0.0.0 area 0
!
Here is the "show ip ospf database: on the switch:
OSPF Router with ID (10.41.101.103) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.41.101.1 10.41.101.1 591 0x8000000A 0x00A989 3
10.41.101.102 10.41.101.102 1708 0x80000159 0x009BAB 2
10.41.101.103 10.41.101.103 1252 0x80000066 0x00F93B 8
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.41.102.1 10.41.101.103 756 0x80000033 0x00CAA3
10.41.120.1 10.41.101.103 1502 0x80000007 0x00D01D
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
0.0.0.0 10.41.101.102 1618 0x80000150 0x00D5A3 0
10.40.0.0 10.41.101.102 1728 0x80000063 0x00D505 0
10.40.1.0 10.41.101.1 349 0x80000005 0x007A9A 0
10.40.101.1 10.41.101.1 349 0x80000005 0x00208F 0
10.40.102.0 10.41.101.1 349 0x80000005 0x001F90 0
10.40.103.0 10.41.101.1 349 0x80000005 0x00149A 0
10.40.110.0 10.41.101.1 366 0x80000005 0x00C6E0 0
10.40.111.0 10.41.101.1 366 0x80000005 0x00BBEA 0
10.40.112.0 10.41.101.1 366 0x80000005 0x00B0F4 0
10.40.117.0 10.41.101.1 366 0x80000005 0x007927 0
10.40.118.0 10.41.101.1 366 0x80000005 0x006E31 0
10.40.120.0 10.41.101.1 366 0x80000005 0x005845 0
10.40.121.0 10.41.101.1 366 0x80000005 0x004D4F 0
10.41.1.0 10.41.101.1 112 0x80000003 0x0081A2 0
10.41.61.0 10.41.101.1 112 0x80000003 0x00EAFC 0
10.41.101.103 10.41.101.1 112 0x80000003 0x002731 0
10.41.102.0 10.41.101.1 112 0x80000003 0x002698 0
10.41.111.0 10.41.101.1 112 0x80000003 0x00C2F2 0
10.41.112.0 10.41.101.1 112 0x80000003 0x00B7FC 0
10.41.117.0 10.41.101.1 112 0x80000003 0x00802F 0
10.41.120.4 10.41.101.1 607 0x80000005 0x00AAA8 0
10.45.1.0 10.41.101.1 366 0x80000005 0x003ED1 0
10.45.61.0 10.41.101.1 366 0x80000005 0x00A72C 0
10.45.102.0 10.41.101.1 366 0x80000005 0x00E2C7 0
10.54.0.0 10.41.101.102 1604 0x8000002D 0x009969 0
10.54.1.0 10.41.101.1 366 0x80000005 0x00D135 0
10.54.101.1 10.41.101.1 366 0x80000005 0x00772A 0
10.54.102.0 10.41.101.1 366 0x80000005 0x00762B 0
10.54.111.0 10.41.101.1 366 0x80000005 0x001385 0
10.54.112.0 10.41.101.1 366 0x80000005 0x00088F 0
10.54.117.0 10.41.101.1 366 0x80000005 0x00D0C1 0
10.54.120.0 10.41.101.1 366 0x80000005 0x00AFDF 0
10.54.120.4 10.41.101.1 366 0x80000005 0x008704 0
192.168.35.0 10.41.101.1 366 0x80000005 0x00B506 0
192.168.36.0 10.41.101.102 1565 0x80000151 0x001C74 0
192.168.45.0 10.41.101.1 366 0x80000005 0x00476A 0
192.168.54.0 10.41.101.1 366 0x80000005 0x00B9F5 0
London-Core-Switch3560#
01-19-2012 03:49 PM
Hello,
They are there but they are included in the type 1 LSA from the advertising router. Each router creates a type 1 LSA for itself. The LSA describes the router, its interfaces in that area and a list of neighboring routers on each interface. If you look again LSA with link id of 10.41.101.103 has a link count of 8. The type 5 is there because of the redistribution statement.
Also may I ask why are running two IGPs between the devices and redistributing between the protocols?
One more comment. Without a metric associated with your redistribute ospf 1 statement, EIGRP will not redistribute the OSPF routes. OSPF I believe applies a default metric of 20 and that's why you see the type 5 LSAs. CAUTION: Are you redistributing like this anywhere else in the network. Without the proper configuration the possibility of routing loops, suboptimal routing, etc could occur and I afraid that this misconfiguration has prevented such scenario from happening.
Regards,
Ryan
01-24-2012 02:33 PM
I think your recomendation to provide a metric worked.
I'm migrating from EIGRP to OSPF, but I'm doing it one site at a time. I don't know if this is the best method, but it seems to be working so far.
Thanks!
Vince
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