From: Jongsoo.Kim@Intelsat.com
Date: Sat Mar 05 2005 - 15:48:43 GMT-3
I am sure many of you know about this.
This is totally news to me. ( I have obvioulsy underestimated the mighty
RIP!)
As passive interface behaves differently between Rip and EIGRP, so does ip
summary-address.
For rip, Ip split-horizon has be to diable for summary-address to be
advertise, while EIGRP don't care about it.
If summary route is announced to BB router, there is no way to find if it
work or not.
For rip, Ip split-horizon has be to diable for summary-address to be
advertise, while EIGRP don't care about it unless you out things right!
This is the very reason I believe Rip is the most tricky in IGP!!!
See below I copy from IOS command.
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_command_refe
rence_chapter09186a008010a39d.html#wp1019063
<http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_command_ref
erence_chapter09186a008010a39d.html#wp1019063>
In the following example the major network is 10.0.0.0. The summary address
10.2.0.0 overrides the autosummary address of 10.0.0.0, so that 10.2.0.0 is
advertised out Ethernet interface 1 and 10.0.0.0 is not advertised.
Note <<...OLE_Obj...>> If split horizon is enabled, neither autosummary nor
interface summary addresses (those configured with the ip summary-address
rip command) are advertised.
router rip
router interface e1
ip address 10.1.1.1 255.255.255.0
ip summary-address rip 10.2.0.0 255.255.0.0
no ip split-horizon
router rip
network 10.0.0.0
Question : Is there any other way to summarize address in rip ?
Regards
Jongsoo
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