Changing OSPF areas causing DHCP failure.
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05-16-2019 11:53 AM - edited 05-16-2019 11:58 AM
At first I kept the OSPF area same i.e. 0. Then for each router I changed the area. For R0 R1 R2 R3 R4 i gave area 0 1 2 3 0 respectively. Now the PCs attached with R4 are failing in getting DHCP IP addresses. What have I done wrong?
Also can you modify it so that same areas don't repeat for different routers.
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05-16-2019 11:59 AM - edited 05-16-2019 12:00 PM
Hello,
>> For R0 R1 R2 R3 R4 i gave area 0 1 2 3 0 respectively. Now the PCs attached with R4 are failing in getting DHCP IP addresses. What have I done wrong?
OSPF requires that all non zero areas connect to area 0 and that area 0 can be only one and must be formed by devices connected by links in area 0.
Try the following:
put R0 in area 1
put R0-R1 link in area 1
make R1 an ABR router for area (0,1) with R0-R1 link in area 1
have R1-R2 links in area 0
R2 in area 0
R3 will be ABR (0,2)
R3 link to R4 in area 2, all other links in area 0
R4 in area 2
This way you have a valid OSPF multiple area design and it should work.
Area 1 --- area 0 ---- area 2
This is correct
Hope to help
Giuseppe
