TCP and UDP are transport layer protocols. RIP uses UDP and BGP uses TCP..
Please clear more how RIP and BGP are application layer ?
Sincerely,
Taqdir Singh
91-9911709496
Do today what others won't So you can live tomorrow what others can't
________________________________
From: Rick Mur <[email protected]>
To: Taqdir Singh <[email protected]>
Cc: prakash patel <[email protected]>; [email protected]
Sent: Wednesday, 19 August, 2009 1:49:38 AM
Subject: Re: [OSL | CCIE_RS] RIP and BGP are application layer protocol
BGP is an application layer protocol since it uses TCP for communicating with
neighbors..
Other protocols like OSPF and EIGRP use their own IP protocol number and are
not relying on TCP or UDP.
Why BGP is not changing the next-hop while advertising in iBGP is definitely a
design decision. Which is an answer to your Why :-)
The reason behind is that you are letting the underlying IGP choose which path
to take to the BGP next-hop. Then it depends on your IGP set-up how the traffic
gets through the network. Of course there are a lot of ways to overcome this,
but you really need to ask yourself if you want to that. If you don't want to
or are not allowed to advertise the link connecting to the eBGP neighbor to be
advertised in your network, then you have no other option that to issue a
next-hop-self for example.
Read RFC 1771 (http://www.ietf.org/rfc/rfc1771.txt) for more exact explanations.
--
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Juniper JNCIA-ER & JNCIA-EX
MCSA:Messaging, MCSE
Sr. Support Engineer – IPexpert, Inc.
URL: http://www.IPexpert.com
On 18 aug 2009, at 16:14, Taqdir Singh wrote:
Hi Prakash
>
>I know we can use next hop self . but that is not answer to my question..
>
>my question....is why BGP is so made to carry next hop of ebgp in internal AS
>?
>
>AS100(C)----e-bgp---AS200(A)----ibgp----AS200(B)
>
>Why BGP was not made so that router A automatically advertise routes to B with
>next hop of itself.. as in case of all the other routing protocols ?
>
>and Why BGP is application layer ?
> Sincerely,
>Taqdir Singh
>91-9911709496
>Do today what others won't So you can live tomorrow what others can't
>
>
>
>
>
________________________________
From: prakash patel <[email protected]>
>To: [email protected]; [email protected]
>Sent: Tuesday, 18 August, 2009 7:31:20 PM
>Subject: RE: [OSL | CCIE_RS] RIP and BGP are application layer protocol
>
>RIP is the oldest one where some hosts can learn RIP routes from router. ON
>host, RIP has to run as application ..am I right?
>
>BGP can change by doing "next-hop-self" so you have that option.
>
>
>
>________________________________
Date: Tue, 18 Aug 2009 19:20:16 +0530
>From: [email protected]
>To: [email protected]
>Subject: [OSL | CCIE_RS] RIP and BGP are application layer protocol
>
>
>Can any1 please clear , how RIP and BGP are application layer protocols ?
>Why BGP is so made to carry the E-BGP next-hop in internal AS ?
> Sincerely,
>Taqdir Singh
>91-9911709496
>Do today what others won't So you can live tomorrow what others can't
>________________________________
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