From: David Ham (ccieau@xxxxxxxxxxx)
Date: Fri May 17 2002 - 00:10:35 GMT-3
Thanks David. But by using table-map and automatic-tag would preserve the
AS-path and origin code when redistributed bgp routes from ospf injecting
into otherside of bgp domain.
Isn't this the pupose of this execise??
Please comment.
Regards,
David Ham
Data Specialist
OPTUS
>From: David Luu <wicked01@ix.netcom.com>
>Reply-To: David Luu <wicked01@ix.netcom.com>
>To: "David Ham" <ccieau@hotmail.com>, sinclairj@powertel.com.au
>CC: ccielab@groupstudy.com
>Subject: RE: POP Quiz - Answers
>Date: Thu, 16 May 2002 18:36:11 -0700
>
>it works correctly...if you want all the routes from ospf to have an origin
>code of "i" then use network statements for the other routes in bgp
>
>At 11:10 AM 5/17/2002 +1000, David Ham wrote:
>>Hi Jason,
>>
>>I have tried on my lab but I have trouble getting orgin code in.
>>I thought I should see origin code "i" at the bgp routes that learnt from
>>ospf but I don't. Am I missing something?
>>
>>Here is my config.
>>
>>R2 -- R3 --- R1
>>----------------------------------------------------------------------
>>R2
>>--snip----
>>interface Loopback0
>>ip address 2.2.2.2 255.255.255.255
>>
>>router ospf 1
>>log-adjacency-changes
>>redistribute bgp 10 subnets
>>network 172.16.7.0 0.0.0.255 area 0
>>!
>>router bgp 10
>>no synchronization
>>table-map set-tag
>>bgp log-neighbor-changes
>>network 2.2.2.2 mask 255.255.255.255
>>redistribute ospf 1 match internal external 1 external 2 route-map tags
>>no auto-summary
>>
>>route-map tags permit 10
>>set as-path tag
>>
>>route-map set-tag permit 10
>>match as-path 1
>>set automatic-tag
>>
>>ip as-path access-list 1 permit .*
>>
>>
>>----
>>
>>R2#sh ip bgp
>>BGP table version is 5, local router ID is 2.2.2.2
>>Status codes: s suppressed, d damped, h history, * valid, > best, i -
>>internal
>>Origin codes: i - IGP, e - EGP, ? - incomplete
>>
>> Network Next Hop Metric LocPrf Weight Path
>>*> 1.1.1.1/32 172.16.7.3 1 32768 ?
>>*> 2.2.2.2/32 0.0.0.0 0 32768 i
>>*> 172.16.1.0/24 172.16.7.3 70 32768 ?
>>*> 172.16.7.0/24 0.0.0.0 0 32768 ?
>>
>>
>>--------------------------------------------------------------------
>>R1
>>---snip--
>>
>>interface Loopback1
>>ip address 1.1.1.1 255.255.255.255
>>
>>router ospf 1
>>log-adjacency-changes
>>redistribute bgp 10 subnets
>>network 172.16.1.0 0.0.0.255 area 0
>>!
>>router bgp 10
>>no synchronization
>>table-map set-tag
>>bgp log-neighbor-changes
>>network 1.1.1.1 mask 255.255.255.255
>>redistribute ospf 1 match internal external 1 external 2 route-map tags
>>no auto-summary
>>
>>route-map tags permit 10
>>set as-path tag
>>!
>>route-map set-tag permit 10
>>set automatic-tag
>>
>>
>>--------
>>R1#sh ip bgp
>>BGP table version is 7, local router ID is 172.16.240.1
>>Status codes: s suppressed, d damped, h history, * valid, > best, i -
>>internal
>>Origin codes: i - IGP, e - EGP, ? - incomplete
>>
>> Network Next Hop Metric LocPrf Weight Path
>>*> 1.1.1.1/32 0.0.0.0 0 32768 i
>>*> 2.2.2.2/32 172.16.1.3 1 32768 ?
>>*> 172.16.1.0/24 0.0.0.0 0 32768 ?
>>*> 172.16.7.0/24 172.16.1.3 70 32768 ?
>>----------------------------------------------------------------------
>>Thanks in advance.
>>Regards,
>>
>>David Ham
>>OPTUS
>>
>>>From: Jason Sinclair <sinclairj@powertel.com.au>
>>>Reply-To: Jason Sinclair <sinclairj@powertel.com.au>
>>>To: "'Carlos G Mendioroz'" <tron@huapi.ba.ar>, Jason Sinclair
>>><sinclairj@powertel.com.au>
>>>CC: Groupstudy ccielab list <ccielab@groupstudy.com>
>>>Subject: RE: POP Quiz - Answers
>>>Date: Thu, 16 May 2002 09:41:45 +1000
>>>
>>>All,
>>>
>>>Please note that I left out the most important part. You also need the
>>>following:
>>>
>>>Router bgp 100
>>>Table-map autotag
>>>
>>>Route-map autotag permit 10
>>>Set automatic-tag
>>>
>>>The difference is that the as-path tag will preserve any as-path info in
>>>the
>>>redistribution and the automatic tag will preserve the origin attribute.
>>>
>>>As I stated earlier time was an issue this last week, in future quizzes I
>>>will ensure that I lab them for you. Also, these quizzes are more
>>>intended
>>>to make you think about things and how they actually work, rather than
>>>always having the correct answer. Please let me know if these are of a
>>>benefit to you.
>>>
>>>Regards,
>>>
>>>Jason Sinclair CCIE #9100
>>>Manager, Network Control Centre
>>>POWERTEL
>>>Ground Level, 55 Clarence Street,
>>>SYDNEY NSW 2000
>>>AUSTRALIA
>>>office: + 61 2 8264 3820
>>>mobile: + 61 416 105 858
>>>* sinclairj@powertel.com.au
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Carlos G Mendioroz [mailto:tron@huapi.ba.ar]
>>> Sent: Thursday, 16 May 2002 01:03
>>> To: Jason Sinclair
>>> Cc: Groupstudy ccielab list
>>> Subject: Re: POP Quiz - Answers
>>>
>>> Jason,
>>> one of the requirements you had was:
>>>
>>> 5. The origin code for your route must be the
>>>same
>>>as
>>> the original origin code when the route was injected
>>>into
>>>BGP
>>>
>>> and it seems its not working with your solution, at
>>>least
>>>for me:
>>>
>>> At rtrC:
>>> BGP table version is 5, local router ID is 2.2.2.2
>>> Status codes: s suppressed, d damped, h history, *
>>>valid, >
>>>best, i -
>>> internal
>>> Origin codes: i - IGP, e - EGP, ? - incomplete
>>>
>>> Network Next Hop Metric LocPrf
>>>Weight
>>>Path
>>> *> 1.1.1.1/32 172.16.1.1 1
>>>32768 ?
>>> *> 2.2.2.2/32 0.0.0.0 0
>>>32768 i
>>> *> 172.16.0.0 0.0.0.0 0
>>>32768 ?
>>> *> 192.168.1.0 172.16.1.1 128
>>>32768 ?
>>>
>>> The origin code for 2.2.2.2 is "i" for a locally
>>>generated
>>>route
>>> (internal)
>>> and the one for the remote loopback is "?" for
>>>incomplete.
>>>
>>> It seems to me that redistributing the igp (ospf) and
>>>connected into
>>> bgp would do the trick (both would be incomplete then)
>>>although
>>> it would not be that interesting...
>>>
>>>
>>> Jason Sinclair wrote:
>>> >
>>> > All,
>>> > Guys,
>>> >
>>> > For pop quiz 1 I have the following configs. I have
>>>not
>>>labbed them due
>>> > to time constraints, however I believe they are
>>>correct.
>>>If you see any
>>> > mistakes please advise.
>>> >
>>> > Configs are:
>>> >
>>> > RtrA
>>> > Int lo0
>>> > Ip address 1.1.1.1 255.255.255.255
>>> >
>>> > Int s0
>>> > Ip address 192.168.1.1 255.255.255.0
>>> >
>>> > Router ospf 100
>>> > Network 192.168.1.0 0.0.0.255 area0
>>> > Redistribute bgp 100 subnets
>>> >
>>> > Router bgp 100
>>> > Network 1.1.1.1 mask 255.255.255.255
>>> > Redistribute ospf 100 route-map tags
>>> > No auto-summary
>>> > No synchronization
>>> >
>>> > Route-map tags permit 10
>>> > Set as-path tag
>>> >
>>> > Rtrb
>>> > Int s0
>>> > Ip address 192.168.1.2 255.255.255.0
>>> > Clock rate 64000
>>> >
>>> > Int s1
>>> > Ip address 172.16.1.1 255.255.255.0
>>> > Clock rate 64000
>>> >
>>> > Router ospf 100
>>> > Network 192.168.1.0 0.0.0.255 area 0
>>> > Network 172.16.1.0 0.0.0.255 area 0
>>> >
>>> > Rtrc
>>> > Int lo0
>>> > Ip address 3.3.3.3 255.255.255.255
>>> >
>>> > Int s0
>>> > Ip address 172.16.1.2 255.255.255.0
>>> >
>>> > Router ospf 100
>>> > Network 172.16.1.0 0.0.0.255 area0
>>> > Redistribute bgp 100 subnets
>>> >
>>> > Router bgp 100
>>> > Redistribute ospf 100 route-map tags
>>> > Network 3.3.3.3 mask 255.255.255.255
>>> > No auto-summary
>>> > No synchronization
>>> >
>>> > Route-map tags permit 10
>>> > Set as-path tag
>>> >
>>> > Cheers,
>>> >
>>> > Jason Sinclair CCIE #9100
>>> > Manager, Network Control Centre
>>> > POWERTEL
>>> > Ground Level, 55 Clarence Street,
>>> > SYDNEY NSW 2000
>>> > AUSTRALIA
>>> > office: + 61 2 8264 3820
>>> > mobile: + 61 416 105 858
>>> > * sinclairj@powertel.com.au
>>> >
>>> > -----Original Message-----
>>> > From: Jason Sinclair
>>> > [mailto:sinclairj@powertel.com.au]
>>> > Sent: Wednesday, 8 May 2002 13:32
>>> > To: 'ccielab@groupstudy.com'
>>> > Subject: POP Quiz
>>> >
>>> > All,
>>> >
>>> > I am proposing to regularly post
>>>little
>>>scenarios to
>>> > this forum. If you see
>>> > any benefit in this, the first is
>>>below:
>>> >
>>> > Quick Scenario 1:
>>> >
>>> > A quick scenario - should take 10
>>>minutes
>>>to achieve.
>>> > Topology is:
>>> >
>>> > RtrA-----rtrB-------rtrC
>>> >
>>> > Rules:
>>> > 1. You can run BGP on rtrA and
>>>rtrC,
>>>but NOT rtrB.
>>> > 2. Any IGP can be run on rtrA,
>>>rtrB,
>>>rtrC.
>>> > 3. Create a loopback on rtrA and
>>>rtrC
>>>and ensure
>>> > that
>>> > the opposite
>>> > route to the loopback is visible to
>>>the
>>>remote router
>>> > via BGP.
>>> > 4. You cannot peer rtrA and rtrC
>>>with
>>>respect to
>>> > BGP
>>> > 5. The origin code for your route
>>>must be the same
>>> > as
>>> > the original
>>> > origin code when the route was
>>>injected
>>>into BGP
>>> > 6. 10 minutes to complete
>>> >
>>> > I will post answers in 5 days time.
>>> >
>>> > Cheers,
>>> >
>>> > Jason Sinclair CCIE #9100
>>> > Manager, Network Control Centre
>>> > POWERTEL
>>> > Ground Level, 55 Clarence Street,
>>> > SYDNEY NSW 2000
>>> > AUSTRALIA
>>> > office: + 61 2 8264 3820
>>> > mobile: + 61 416 105 858
>>> > * sinclairj@powertel.com.au
>>> >
>>> >
>>> >
>>>
>>>
>>> --
>>> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI
>>>Argentina
>>>
>>>
>>>**********************************************************************
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>>>Best Emerging Telco, Australian Telecom Awards 2001
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