# Introduction to Route Summarization

**URL:** https://forum.networklessons.com/t/introduction-to-route-summarization/1350
**Category:** Lessons Discussion
**Created:** [December 29, 2016, 9:29pm UTC](https://forum.networklessons.com/t/introduction-to-route-summarization/1350 "2016-12-29T21:29:20Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![varma402](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/v/5fc32e/32.png) [@varma402](https://forum.networklessons.com/u/varma402)
#### Post date: [May 14, 2019, 8:51am UTC](https://forum.networklessons.com/t/introduction-to-route-summarization/1350/6 "2019-05-14T08:51:22Z")

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Hii Rene,

1st query:  
`no auto-summary` command is issued to disable summary.  
and to enable summary can we use `R1(config-router)#auto-summary` command instead of using `R1(config-if)#ip summary-address rip 172.16.0.0 255.255.0.0`

2nd Query:

```
R1#
RIP: sending v2 update to 224.0.0.9 via GigabitEthernet0/1 (192.168.12.1)
RIP: build update entries
        172.16.0.0/24 via 0.0.0.0, metric 1, tag 0
        172.16.1.0/24 via 0.0.0.0, metric 1, tag 0
        172.16.2.0/24 via 0.0.0.0, metric 1, tag 0
        172.16.3.0/24 via 0.0.0.0, metric 1, tag 0 

```

In above RIP update why network is advertising via"0.0.0.0" ?

Regards,  
Chandra

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