[j-nsp] Strange MPLS behaviour

[Josef Buchsteiner]

in all cases the 'source' knob should override the default primary
address source selection for icmp or lsping. The primary address
does not need to be lo0 or fpx0 however after a reboot it is the
first interface.

Josef

Wednesday, December 22, 2004, 7:51:06 AM, you wrote:

  
AAGE> Hello Jonas,

AAGE>  I see Your point. However, fxp0 is just one of router
AAGE> interfaces and is perfectly eligible of being selected as
AAGE> "primary", see
AAGE> http://www.juniper.net/techpubs/software/junos/junos64/swconfig64-interfaces/html/interfaces-family-config11.html#1014302
AAGE> and
AAGE> http://www.juniper.net/techpubs/software/junos/junos64/swconfig64-interfaces/html/interfaces-family-config12.html#1014326
AAGE> . However, my tests show me that "primary" does not work for
AAGE> locally generated MPLS PING (UDP dport 3503) traffic - see my
AAGE> email below.

AAGE>  HTH,
AAGE>  Cheers
AAGE>  Alex


AAGE>  -----Original Message-----
AAGE>  From: Jonas Frey [mailto:jf at probe-networks.de]
AAGE>  Sent: 22 December 2004 06:20
AAGE>  To: Alexander Arsenyev (GU/ETL)
AAGE>  Cc: juniper-nsp at puck.nether.net
AAGE>  Subject: RE: [j-nsp] Strange MPLS behaviour


AAGE>  Hello Alex,

AAGE>  thats exactly what i observed, we were only using 127/8 ip addresses on
AAGE>  lo0 before. To fix all this we added "real" ip addresses to lo0 and now
AAGE>  things work. However i dont think its a good idea to send out packets
AAGE>  sourced from fxp0 anyway.

AAGE>  Running 6.4R2.4 here.

AAGE>  Regards,
AAGE>  Jonas

AAGE>  On Wed, 2004-12-22 at 01:17, Alexander Arsenyev (GU/ETL) wrote:
 >> Hello,
 >>
 >> It is indeed very interesting scenario.
 >>
 >> I actually labbed this up and source IP address of locally
 >> generated ping packets depends on:
 >> a) whether lo0.0 has a valid (non-127/8) IP address assigned
 >> (if not then fxp0.0 IP address is used as source IP)
 >> b) whether ICMP ping or MPLS PING (UDP dport 3503) is used
 >> (MPLS PING packets use lo0.0 or fxp0.0 IP address as source IP,
 >> while ICMP ping packets use lo0.0 or outgoing interface' IP address as source IP)
 >> c) whether "default-address-selection" is configured
 >> (if configured then lo0.0 IP address is used as source IP)
 >> I used JUNOS 5.6 in my tests, what is Your JUNOS version?
 >> HTH,
 >> Cheers
 >> Alex
 >>
 >>
 >> -----Original Message-----
 >> From: juniper-nsp-bounces at puck.nether.net
 >> [mailto:juniper-nsp-bounces at puck.nether.net]
 >> Sent: 21 December 2004 08:32
 >> To: sthaug at nethelp.no
 >> Cc: juniper-nsp at puck.nether.net
 >> Subject: Re: [j-nsp] Strange MPLS behaviour
 >>
 >>
 >>
 >> > set system default-address-selection
 >> >
 >> > Steinar Haug, Nethelp consulting, sthaug at nethelp.no
 >>
 >> Thats a good idea but if i do not want/cant use that option, i'd like to
 >> have the router actually use the ip address on the interface the lsp is
 >> running on. Also i have to/from statements in the lsp config so i dont
 >> understand why the router still uses completly different (fxp0)
 >> addresses. This doesnt make sense.
 >>
 >> Regards,
 >> Jonas
 >>
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