I’m trying to summarize a few routes and the router keeps auto adjusting my summarization. Summarization for v6 is pretty darn easy and it’s driving me nuts.

Summarize fec0::43:0/125 and fec0::53:0/125.

I come up with fec0::40/98.

The router is auto adjusting that summary for ipv rip to fec0::/98.

I don’t get it.

thanks in advance!

On R6 I receive 4 routes via EIGRP and redistribute them into BGP then send it via EBGP to R4. On R4 I need to get a summary-route and the specific-routes for 200.0.0.0/24and 200.0.1.0/24. I cannot change the aggregate-mask.

R6 router bgp 200 aggregate-address 200.0.0.0 255.255.252.0 advertise-map ADVERTISE redistribute eigrp 10 neighbor 158.5.46.4 remote-as 100 –> R4

route-map ADVERTISE permit 10 match ip address prefix-list EIGRP ! route-map ADVERTISE deny 20 ! ip prefix-list EIGRP seq 5 permit 200.0.0.0/24 ip prefix-list EIGRP seq 10 permit 200.0.1.0/24

Those who are planning to appear in CCIE R&S lab in a next couple of weeks can unicast me for group study. Thanks!

Regards,

Blogs and organic groups at http://www.ccie.net

_______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

Rgs,

2010/9/4 Obaidullah Obaidi

> Dear All, > > Can anyone please tell me about CCIE R&S Bootcamps Training Center in > India. > > Regards > > — > Obaidullah Obaidi Deputy Director General IT Department Da Afghanistan > Bank Ibnesina watt Kabul Afghanistan Tel : +93 (20) 210 4824 Cell: +93 > (799) 209 870 Fax: +93 (20) 210 3925 website: www.centralbank.gov.af > > > Blogs and organic groups at http://www.ccie.net > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net

_______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

Thanks,

Karthik.

Blogs and organic groups at http://www.ccie.net

_______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

Thanks

Blogs and organic groups at http://www.ccie.net

_______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

EIGRP will auto summarize prefixes to their classful boundaries if, and only if, the router has a connected, internal network in that classful network. RIP auto summary will summarize prefixes to their classful boundaries whether or not the router has a connected network in the classful prefix.

For example, suppose EIGRP on R1, R2 and R3 in the following network:

10.10.10.0/24–R1–172.16.10.0/24–R2–172.16.20.0/24–R3

If auto summary is enabled on R1 and both networks are internal, R1 will auto summarize. R2 and R3 will see 10.0.0.0/8. If the router were running RIP v2, instead of EIGRP, you would see the same results

If auto summary is enabled on R1 and 10.10.10.0 is redistributed into EIGRP, R1 will not summarize. R2 and R3 will see 10.10.10/24. If they were running RIP v2, instead of EIGRP, R1 would auto summarize; RIP has no clue re internal or external.

If auto summary was disabled on R1, but enabled on R2, EIGRP on R2 would not auto summarize the 10.10.10.0/24 network. RIP would.

Highly recommend you lab this up and check it out. If you see anything different, let me know!

Bob Sinclair CCIE 10427 CCSI 30427 CIERS2 Online Instructor www.tinyurl.com/ciers2online

> —–Original Message—– > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of > Bilal Hansrod > Sent: Saturday, September 04, 2010 9:44 AM > To: Cisco certification > Subject: Auto Summary Revisited > > Hello Team, > > I’m trying to get my head around to understand EIGRP auto-summary. I > have > read some archive and various material, but unable to understand in > detail. > What I understood so far is that, EIGRP auto-summary will summarise > routes > that have same first 8 bit, For example, > > R1 has multiple loopbacks 10.0.0.0/24, 10.0.1.0/24, 10.1.0.0, > 10.2.0.0/24,11.0.0.0/24, 11.1.0.0/24, 12.1.1.0/24, 12.2.2.0./24, so if > the > auto-summary is enabled, it will create a summary route in it’s routing > table and point to null interface to as a loop prevention technique. > Then it will advertise 10.0.0.0/8, 11.0.0.0/8, 12.0.0.0/8 to neighbour > routers. Is this correct understanding, if not can anyone please > explain. > What will happen if that was RIP with auto summary enabled. > > Regards, > > Bilal > > > Blogs and organic groups at http://www.ccie.net > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html > > > > > > > > No virus found in this incoming message. > Checked by AVG – www.avg.com > Version: 9.0.851 / Virus Database: 271.1.1/3113 – Release Date: > 09/04/10 02:34:00

Blogs and organic groups at http://www.ccie.net

_______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

I’m trying to get my head around to understand EIGRP auto-summary. I have read some archive and various material, but unable to understand in detail. What I understood so far is that, EIGRP auto-summary will summarise routes that have same first 8 bit, For example,

R1 has multiple loopbacks 10.0.0.0/24, 10.0.1.0/24, 10.1.0.0, 10.2.0.0/24,11.0.0.0/24, 11.1.0.0/24, 12.1.1.0/24, 12.2.2.0./24, so if the auto-summary is enabled, it will create a summary route in it’s routing table and point to null interface to as a loop prevention technique. Then it will advertise 10.0.0.0/8, 11.0.0.0/8, 12.0.0.0/8 to neighbour routers. Is this correct understanding, if not can anyone please explain. What will happen if that was RIP with auto summary enabled.

Regards,

Bilal

Blogs and organic groups at http://www.ccie.net

_______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

Is VLAN Tagging in the ISP edge used to allot bandwidth (VPLS / L2 VPN) for customers ?

regards, sakthi

Blogs and organic groups at http://www.ccie.net

_______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

Can anyone please tell me about CCIE R&S Bootcamps Training Center in India.

Regards