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Questions tagged [route-summarization]

For questions about route summarization, a method for collapsing multiple routes into a single route which covers all the collapsed routes.

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3
votes
1answer
66 views

BGP | Advertise a summary prefix out to customer location

I don't know what I should be using for this or how I should go about it. In my lab where I am testing out the BGP configs that I've learned I want my ISP topology to have a summary prefix for the ...
1
vote
1answer
89 views

Cisco numeric EIGRP routing IP summarizing and routing

I have 2 routers connected via Serial 0/0/0 both running EIGRP with an ASN of 65000, and i want to advertise and summarize the interfaces, being just my loopbacks, and set the loopbacks as passive. ...
1
vote
1answer
54 views

EIGRP manual summarization prevent dual query

In EIGRP, manual summarization will prevent/ limit dual query. Is it true ? How can we limit the dual query by introducing manual summary ?
1
vote
1answer
117 views

Multicast summarization

I was wondering, does it make any sense to summarize(supernet) multicast IPv4 addresses ? Can anyone please explain why yes, or no ?
1
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3answers
869 views

OSPF LSA type 3

This is what I know about LSA types from what I've learnt. LSA type 1 is circulated inside an area and doesn't get to other areas. LSA type 3 is sent from one area(From backbone to non-backbone and ...
3
votes
2answers
469 views

Why I Can't Summarize (aggregate) These Subnets in BGP router?

In a BGP routing context, giving these networks address: 192.168.0.0 /28 192.168.0.32 /28 For me, the summary address will be : 192.168.0.0 /26 But someone tells me that this is impossible because ...
2
votes
1answer
1k views

Difference in VLSM and FLSM in Rute Summarisation

Is there any specific advantage that VLSM or FLSM has over the other when it comes to route summarization? I was of the opinion that neither had an advantage over the other when it came to route ...
1
vote
2answers
252 views

Summary address any technique? [duplicate]

I was answering some Summary Address questions, and one problem is this. 192.168.1.0 through 192.168.120.0. do I really need to one by one 1 to 120 convert them to binary and to find where is the ...
9
votes
2answers
2k views

Why do summary routes get a low Administrative Distance?

Why do summary routes get a lower AD than other routing protocols? For example: The AD of EIGRP is 90, whereas the AD of a summary route is 5.
1
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3answers
1k views

Summarize subnet from 4 ip addresses

I am trying to figure out how to summarize the subnet for ip route. I am following this information here... http://www.pearsonitcertification.com/articles/article.aspx?p=2169746&seqNum=7 It ...
4
votes
1answer
591 views

incorrect subnet mask for route summarization

I am learning about route summarization and how it represent different subnets with a single address and single subnet mask, for example, if i have two subnets, 10.1.1.0 10.1.2.0 The summarized ...
19
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7answers
6k views

Does CIDR really “do away” with IP address classes?

I am still struggling to understand to what extent CIDR really renders IP address classes obsolete. Here's what I understood so far: It's ridiculously inefficient (and impossible, too) to assign ...
10
votes
2answers
786 views

ipv6 Aggregatable global unicast addresses

Studying IPv6 addressing I haven't understood IPv6 aggregable global unicast addresses, I mean on RFC 4291 there is a generic scheme: | n bits | m bits | 128-n-m bits ...
10
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3answers
4k views

3 subnets, 2 OSPF areas - Will This Work?

Will any issues occur if I have a topology involving 3 subnets and two OSPF areas where one subnet is in AREA 0 and the other two subnets are both in AREA 1? For example: [area 1, subnet 1]---[ABR #...
5
votes
2answers
2k views

Summarized route not being shared in EIGRP

Working through a lab for CCNP prep. Task is simple - create 4 loopback addresses on R3 - all 172.16.X.0/24 addresses, and share the routes to neighboring routers so that they appear as /22's instead....