MPLS-OPS - Discussion of Multiprotocol Label Switching ()

Muhammad Tahir | 2 Feb 2005 13:31

Picon

: some questions

Hi,
I am begginer in MPLS field. I have just started
reading MPLS. I have some questions (I tried to answer
myself but i want to confirm/correct/verify them!!)

Q1: Why each LSP created is unidirectional?
POSSIBLE ANSWER:
It is hardware dependent or It depends upon the label
distribution protocol e.g. in case of LDP it is
unidirectional but in case of RSVP it is
bidirectional? 

Q2: Upto what time LSP session persists? or in other
words when and how LSP is terminated?
POSSIBLE ANSWER:
It is terminated when there is request of termination
from upstream/downstream? (usual termination)
It may terminate when there is link failure or device
problem etc. (unusual termination).

Q3: LSP session is created for one time data
transmission (e.g. of all the packets of one FEC)? or
this session will continue for other packets which
arrive when upstream was delivering data?

Thanks a lot

Tahir

(Continue reading)

Muhammad Tahir | 3 Feb 2005 12:25

Picon

: MPLS Hierarchy

Hi,
please clear the situation:

reference:(framework for mpls, draft, page 51)
http://www.ietf.org/internet-drafts/draft-ietf-mpls-framework-05.txt

1:
Is it necessary that we MUST make level only at
IGP(OSPF etc) and BGP based?
It means that there will be ONLY two levels in each
domain???
If yes, then there will be only two labels in each
domain (at maximum) one is OSPF label and other will
be BGP label??
If there is another nested LSP (level) tunnel in
domain 2, then I think there will be three labels at
one time???

2:
framework for mpls, draft, page 51)
http://www.ietf.org/internet-drafts/draft-ietf-mpls-framework-05.txt

Because R4->R7 is a OSPF level, so R6 will be
penultimate and R7 will be the egress of that level
(tunnel), and also R7 will act as the penultimate for
the R8??? Is it true?? If YES then:
R8 will receive unlabelled packet (because R7 will act
as the penultimate for R8), and R8 will attach a new
BGP label that will be for R9 in the next domain????
Is it true???

(Continue reading)

Muhammad Tahir | 3 Feb 2005 12:38

Picon

: MPLS hierarchy with figure

Plz check the figure given below for my previous question "MPLS hierarchy", i found that link is
not working. thanks

   .................    ........................    ................
   .               .    .                      .    .              .
   .               .    .                      .    .              .
   .R1           R2------R3                  R8------R9         R10.
   .               .    . \                 /  .    .              .
   .               .    .  R4---R5---R6---R7   .    .              .
   .               .    .                      .    .              .
   .   Domain#1    .    .       Domain#2       .    .    Domain#3  .
   .................    ........................    ................

            Figure 1: Example of the Use of MPLS in a Hierarchy

		
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Garry Glendown | 6 Feb 2005 01:42

: Problem with MPLS over DSL

Hi,

I've been working on our backup link, which is a multilink PPP 
connection over a DSL link. I've gotten the basic link and stuff running 
so far, but MPLS is still giving me some headache ...

I think I have all the MTU setting correct (MTU, adjust mss, etc.), and 
am at a point where the routers just puzzle me ...

The backup link has a 7200 on each side, one with l2tp dialin, the other 
with a PA4E for PPPoE dialout. I have configured the dialin side (via 
Radius) to enable tag-switching, which works out fine:

dsl-gw.ffm#show int vi29 conf
Virtual-Access29 is an VPDN link (sub)interface

Derived configuration : 300 bytes
!
interface Virtual-Access29
  mtu 1492
  bandwidth 3072
  ip unnumbered Loopback1
  ip tcp adjust-mss 1452
  ip ospf cost 2000
  timeout absolute 50 0
  tag-switching mtu 1452
  tag-switching ip
  peer default ip address pool dsl-pool
  keepalive 60
  down-when-looped

(Continue reading)

Puddinhead Wilson | 7 Feb 2005 11:31

Picon

Re: : some questions

Let me try answering these:

 --- Muhammad Tahir <muhammadtahir2000 <at> yahoo.com>
wrote: 
> Hi,
> I am begginer in MPLS field. I have just started
> reading MPLS. I have some questions (I tried to
> answer
> myself but i want to confirm/correct/verify them!!)
> 
> Q1: Why each LSP created is unidirectional?
> POSSIBLE ANSWER:
> It is hardware dependent or It depends upon the
> label
> distribution protocol e.g. in case of LDP it is
> unidirectional but in case of RSVP it is
> bidirectional? 

No. LSPs are unidirectional.

> 
> Q2: Upto what time LSP session persists? or in other
> words when and how LSP is terminated?
> POSSIBLE ANSWER:
> It is terminated when there is request of
> termination
> from upstream/downstream? (usual termination)
> It may terminate when there is link failure or
> device
> problem etc. (unusual termination).

(Continue reading)

Puddinhead Wilson | 7 Feb 2005 11:34

Picon

Re: : MPLS Hierarchy


> Hi,
> please clear the situation:
> 
> reference:(framework for mpls, draft, page 51)
>
http://www.ietf.org/internet-drafts/draft-ietf-mpls-framework-05.txt
> 
> 1:
> Is it necessary that we MUST make level only at
> IGP(OSPF etc) and BGP based?
> It means that there will be ONLY two levels in each
> domain???

If you just run BGP all over, there is just one level
:)

> If yes, then there will be only two labels in each
> domain (at maximum) one is OSPF label and other will
> be BGP label??

What BGP label are you referring to?

	
	
		
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(Continue reading)

Mansoor Khan | 7 Feb 2005 12:56

Picon

RE: : Problem with MPLS over DSL


Hi Garry,

Try changing the tag-switching mtu to 1526

Cheers,

MK

-----Original Message-----
From: Garry Glendown [mailto:garry <at> regio.net] 
Sent: 6/Feb/2005 12:00 AM
To: mpls-ops <at> mplsrc.com
Subject: [MPLS-OPS]: Problem with MPLS over DSL

Hi,

I've been working on our backup link, which is a multilink PPP 
connection over a DSL link. I've gotten the basic link and stuff running 
so far, but MPLS is still giving me some headache ...

I think I have all the MTU setting correct (MTU, adjust mss, etc.), and 
am at a point where the routers just puzzle me ...

The backup link has a 7200 on each side, one with l2tp dialin, the other 
with a PA4E for PPPoE dialout. I have configured the dialin side (via 
Radius) to enable tag-switching, which works out fine:

dsl-gw.ffm#show int vi29 conf
Virtual-Access29 is an VPDN link (sub)interface

(Continue reading)

Muhammad Tahir | 7 Feb 2005 14:44

Picon

Re: : MPLS Hierarchy

According to figure: (what I understand is)

There will be only TWO labels in a label stack at one time, one for IGP: to travel the
packet within the domain and the second for BGP label at the boundary of the domain to
transfer the packet towards next domain. 

(BUT, according to RFC 3031(section 3.27.3), if there are two or more tunnels in ONE
domain, then there will be 3 or more labels in one label stack at the inner most tunnel.)

so for me this is a little bit confusing!!!!

Tahir

--- Puddinhead Wilson <puddinghead_wilson007 <at> yahoo.co.uk> wrote:

>  
> > Hi,
> > please clear the situation:
> > 
> > reference:(framework for mpls, draft, page 51)
> >
> http://www.ietf.org/internet-drafts/draft-ietf-mpls-framework-05.txt
> > 
> > 1:
> > Is it necessary that we MUST make level only at
> > IGP(OSPF etc) and BGP based?
> > It means that there will be ONLY two levels in each
> > domain???
> 
> If you just run BGP all over, there is just one level

(Continue reading)

Madhusudhan Bhadri | 7 Feb 2005 15:07

Picon

: Fixed Filter Mode in Cisco

Hi,
I was trying to create a tunnel. The session flags always show Shared Explicit
in Path message.
Can anybody let me know if I can configure Fixed Filter Mode in Cisco Router.
Thanks in Advance
Madhu

Puddinhead Wilson | 7 Feb 2005 15:21

Picon

Re: : MPLS Hierarchy

Hi,

--- Muhammad Tahir <muhammadtahir2000 <at> yahoo.com>
wrote: 
> According to figure: (what I understand is)
> 
> There will be only TWO labels in a label stack at
> one time, one for IGP: to travel the
> packet within the domain and the second for BGP
> label at the boundary of the domain to
> transfer the packet towards next domain. 
>

I do not think the IGP label is needed eitherways. The
only purpose it may serve is neighbour discovery. (I
think there are some extensions for RSVP for
autodiscovery but have not kept up with drafts)

> (BUT, according to RFC 3031(section 3.27.3), if
> there are two or more tunnels in ONE
> domain, then there will be 3 or more labels in one
> label stack at the inner most tunnel.)
> 
> so for me this is a little bit confusing!!!!
> 

I think the RFC goes with the design of nesting LSPs
for intercarrier scenarios etc. Whereas another
pragmatic approach could be to split customers across
routers. (The Virtual router approach, where BGP gives

(Continue reading)

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