BGP decision algorithm - help needed - stumped
Hello gurus! hoping for a BGP expert to chime in here. Im studying for my CCIE, and there is something in Jeff Doyle's Routing TCP/IP vol2 book that I just cant seem to figure out and its really stalling my understanding of the BGP path selection algorithm.
Its on pg 195, example 3-57, attached as an image in this post (Ive also attached the network diagram that this output refers to). Basically its an output of "show ip bgp" and whats stumping me is simply: for the aggregate route 192.168.192.0/21, why has this router selected as best (>) the one via next hop 192.168.1.254?? I would have thought based on the presence of the LocalPref = 100 on the 192.168.1.237 route that would have been selected. But apparently not! Heres a walk through of the path selection logic as i understand it:
1/WEIGHT: both 0, so skipped.
2/LOCAL_PREF: this is my problem, .237 should win, but ignoring for now...
3/ORIGINATED LOCALLY: neither are they are learnt from BGP peers, so skipping.
4/AS_PATH: both identical, AS100 only, so skipping
5/ORIGIN CODE: both are 'i' (IGP), both were created from "aggregate-address" statements on their originating routers downstream in AS100
6/MED: both empty, so skipping
7/PREFER [eBGP] over [confedBGP] over iBGP: so the .254 route apparently wins on this condition... which in isolation, i agree with (clearly the eBGP .254 route is better than the .237 iBGP candidate).
.... however what about step 2/LOCAL_PREF!?
looking forward to some expert guidance here to help me squash this one :)
thank in advance,
Keiran
Hello,
Keiran are you talking about "Orgin" attribute or ORIGINATED LOCALLY as this attribute i am not able to find it...that attribute anywhere:
http://netcerts.net/bgp-path-attributes-and-the-decision-process/
Path Attributes:
Attribute
Class
ORIGIN
Well-know mandatory
AS_PATH
Well-know mandatory
NEXT_HOP
Well-know mandatory
LOCAL_PREF
Well-know discretionary
ATOMIC_AGGREGATE
Well-know discretionary
AGGREGATOR
Optional transitive
COMMUNITY
Optional transitive
MULTI_EXIT_DISC (MED)
Optional nontransitive
ORGINATOR_ID
Optional nontransitive
ORGINATOR_ID
Optional nontransitive
CLUSTER_LIST
Optional nontransitive
Also there is similar question on learning forums:
https://learningnetwork.cisco.com/thread/36845
From the forum:
"Locally Originated means that the local router is the one that generated the route with either a network statement, and aggregate statement, redistribution, or conditional route injection. It's not an attribute that is included in the UPDATE messge, instead it's just used by the local process as part of the path selection, where the router will prefer its own locally originated routes over someone else's origination of the same prefix."
Hopefully this will help.
BTW i am reading same book and too bad Mr. Doyle did not include full configs for all routers, as i am trying to simulate his scenarios sometimes it is not working as in his book, now i have issue on next page 197 why Orgin IGP is not taking precedence over Incomplete even if one is learned via EBGP and other over iBGP...driving me nuts.
Regards,
Lukasz
Similar Messages
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BGP decision algorithm nitty-gritty (relationship of locally originated routes to weight attribute)
Hello everyone, i have a question on this algorithm. Specifically the relationship between (cisco specific) WEIGHT which is right at the top of the path selection algorithm.... and routes that are ORIGINATED_LOCALLY (3rd one down, after weight and local_pref).
Heres the relevant steps of the decision tree:
1/WEIGHT (highest wins)
2/LOCAL_PREF (highest wins)
3/ORIGINATED LOCALLY (prefer locally originated over peer learnt)
Whats confusing to me is that Jeff's book tells us that if a prefix is ORIGINATED_LOCALLY (ie entered into BGP on that same router - either by a network/aggregate-address statement, or from redistribution) then its WEIGHT will also be set to 32768 (as opposed to a BGP peer learnt route whose WEIGHT is set to 0). I understand this.
My question is why??? Seems to me that if this is the case there is little purpose of having ORIGINATED_LOCALLY in the decision tree at all, as the logic will never get there on account of the the propagation of its value into (the higher up) WEIGHT decision. This also in turn means that ORIGINATED_LOCALLY has the power to override the attribute LOCAL_PREF.... so couldn't this whole logic be simplified to be:
1/WEIGHT or ORIGINATED LOCALLY
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This very thing has confused another user on another post too, that user writes: "I tried thinking of an example where "ORIGINATED LOCALLY" works but weight doesn't, but couldn't think of any."
looking forward to the thoughts of this community.
Thanks in advance, Keiran.
PS> perhaps the attached diagram will help visualise this.Thanks for your reply shaikhkamran123, i hadn't considered the multivendor environment (where cisco specific concept of 'weight' would be irrelevant to those routers), so yes their decision would start with:
1) Local Preference
2) Locally originated
as opposed to cisco
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but it still doesn't really explain why cisco chose to alter their inbuilt weight based on if a route was locally originated. This alters the logic of the above decision algorithm: ie if its locally originated, it will set a high weight (32768), which will be preferred.... and heres the main thing *BEFORE* local_pref is even looked at. So in other words decision criteria#3, gets merged into #1, skipping ahead of #2. Am i going crazy here??
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import javax.swing.JPanel;
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WHERE SUB_ID = C.SUB_ID3) AS SUBJECT_NAME3
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FROM SUBJECTS
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Help needed .
I have an internal table having 6 .
Ex :
f1 f2 f3 f4 f5 f6
a aa 11 p1 10 10
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Now i want to sum the fields f5 and f6 individually and need to display based upon the fields f1 and f4.
To Display :
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ThanksHere you go
DATA:
BEGIN OF cur_tab OCCURS 0,
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f2(2) TYPE c,
f3(2) TYPE c,
f4(2) TYPE c,
f5(2) TYPE c,
f6(2) TYPE n,
END OF cur_tab.
DATA:
BEGIN OF sum_tab OCCURS 0,
f1 TYPE c,
f4(2) TYPE c,
f5 TYPE p,
f6 TYPE p,
END OF sum_tab.
DATA:
BEGIN OF final_tab OCCURS 0,
f1 TYPE c,
f2(2) TYPE c,
f3(2) TYPE c,
f4(2) TYPE c,
f5(5) TYPE c,
f6(5) TYPE c,
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START-OF-SELECTION.
cur_tab-f1 = 'a'.
cur_tab-f2 = 'aa'.
cur_tab-f3 = '11'.
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cur_tab-f5 = '10'.
cur_tab-f6 = '10'.
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cur_tab-f2 = 'aa'.
cur_tab-f3 = '11'.
cur_tab-f4 = 'p1'.
cur_tab-f5 = '20'.
cur_tab-f6 = '20'.
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cur_tab-f1 = 'b'.
cur_tab-f2 = 'aa'.
cur_tab-f3 = '11'.
cur_tab-f4 = 'p2'.
cur_tab-f5 = '30'.
cur_tab-f6 = '30'.
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COLLECT sum_tab.
ENDLOOP.
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READ TABLE cur_tab WITH KEY f1 = sum_tab-f1
f4 = sum_tab-f4.
IF sy-subrc NE 0.
WRITE:/ 'Something went very wrong'.
CONTINUE.
ENDIF.
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MOVE-CORRESPONDING sum_tab TO final_tab.
APPEND final_tab.
ENDLOOP.
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AT 5 final_tab-f2,
AT 10 final_tab-f3,
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AT 25 final_tab-f6.
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My address book was populated on an imac running Lion and I used time machine to back up to an external hard drive. The imac crashed and I've purchased another one running Mavericks. How do I import the contents of my address book from the backup on
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Hi: I have an Adsense account but I get the ads, when I publish iWeb content it does with the google code needed. iWeb tells me I have correctly configured my Adsense account. In his day working, which is not that I could change or if I reset or dele
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HT1600 why will my i mac not mirror image to my apple tv
My Imac with mirror imaging turned on will not show on my apple tv Processor 3.2 GHz Intel Core i3 Memory 4Gb 1333 MHz DDR3 Graphics ATi Radeon HD 5670 512 MB I bought my apple tv at christmas because I wanted to be to watch what I see on my Imac sc
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Installing new keyboard actions to the JList
Hi I want to install replace the arrow keys and use the numpad keys to go next and previous item in JList also I dont want to show to Popup bar in gui but in the the following code it is not working for the when I install KeyboardActions to the List
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Plz help guys