10-09-2011 04:32 PM - edited 03-07-2019 02:41 AM
Hi every body.
It has been a long while since I came to this forum last time.
1) Here is my setup:
R1-area 0-----R2---area 1-----R3
R1 has loopback addresses: 10.1.1.1/24 10.1.2.2/24 ( these loopback addresses are configured with network type point to point)
R2 is ABR.
The goal is the summarize 10.1.1.0/24 10.1.2.0/24 as 10.0.0.0/8 and inject it into area 1 at ABR.
R2 configuration is shown below:
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
area 1 range 10.0.0.0 255.0.0.0
network 199.199.199.2 0.0.0.0 area 0
network 200.200.200.2 0.0.0.0 area 1
Routing table at R2 is shown below:
C 200.200.200.0/24 is directly connected, Serial0/1
C 199.199.199.0/24 is directly connected, Serial0/0
10.0.0.0/24 is subnetted, 2 subnets
O 10.1.2.0 [110/65] via 199.199.199.1, 00:10:29, Serial0/0
O 10.1.1.0 [110/65] via 199.199.199.1, 00:10:29, Serial0/0
The problem is R2 is not summarizing the following routes as 10.0.0.0/8 and injecting it into area 1 even though" area1 range 10.0.0.0 255.0.0.0 " is configured.
O 10.1.2.2
O 10.1.1.0
2) My second question is can we summarize external routes at abr? for example if R2 is abr and has following routes, can we perform summarization at abr? I understand Such summarization should be done at asbr but iam just curious.
OE2 199.199.198.0/255
O E2 199.199.199.0/255
Thanks and have a great week.
Solved! Go to Solution.
10-09-2011 06:38 PM
10-09-2011 06:43 PM
10-09-2011 08:16 PM
Question 1 - yes glad that you figured it out.
Question 2 - no you can not summarize external at ABR, only at ASBR.
HTH
Rick
Sent from Cisco Technical Support iPhone App
10-09-2011 06:22 PM
I found the answer for the first question.
area x range 10.0.0.0 255.0.0.0
area x refers to the area where subnets exist. In my set up, I erroneously configured area 1 rather than area 0.
thanks and have a great week
10-09-2011 06:43 PM
Sarah,
Sorry, I did not see your second post.
glad you figured it out
10-09-2011 06:38 PM
Sara
summarize to area 0 not 1
HTH
10-09-2011 08:16 PM
Question 1 - yes glad that you figured it out.
Question 2 - no you can not summarize external at ABR, only at ASBR.
HTH
Rick
Sent from Cisco Technical Support iPhone App
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