Mailing List Archive

On 11.12.2003 19:26:10 +0000, Marco Marletta wrote:
> Hi all,
> suppose my Juniper router has a full-routing BGP peering with AS X, on
> interface whose IP is y.y.y.y/30.
> I don't propagate internally the routes I receive from AS X because it is
> active only for test purpose.
> This router receives also the full-routing table from other iBGP peers.
> How can I perform traceroutes from my Juniper through AS X towards all
> destinations I receive on this eBGP peering, instead of using the best
> routes coming from inside?

You cannot prefer the eBGP routes locally on the router and not
re-advertise to iBGP neighbours?

> I want to test the AS X capability of reaching some destinations without
> using it for traffic...

Or a quick hack prefer a couple of hosts (random /32 in what ever
interesting prefix reachable via your new peer) via a static route
pointing at your new peer.

> N.B.
> traceroute <desired destination> source y.y.y.y gateway y.y.y.y-1
> bypass-routing
> appears not to work...

luser@router> traceroute 12.2.88.0 bypass-routing interface so-1/2/2

Works for me - until I managed to crash the M160 5 sec. later ;)

/Michael

--
Michael Lyngb?l -- michael at lyngbol dot dk
Network Architect, AS3292 TDC, IP?backbone

> > How can I perform traceroutes from my Juniper through AS X towards all
> > destinations I receive on this eBGP peering, instead of using the best
> > routes coming from inside?
>
> You cannot prefer the eBGP routes locally on the router and not
> re-advertise to iBGP neighbours?

Too difficult.. i have some more eBGP peers.. distinguish eBGP routes by
neighbor.. i needed a quick-hack ;-)

>
> > I want to test the AS X capability of reaching some destinations without
> > using it for traffic...
>
> Or a quick hack prefer a couple of hosts (random /32 in what ever
> interesting prefix reachable via your new peer) via a static route
> pointing at your new peer.

Yep! That's a quicker hack :-)

>
> > N.B.
> > traceroute <desired destination> source y.y.y.y gateway y.y.y.y-1
> > bypass-routing
> > appears not to work...
>
> luser@router> traceroute 12.2.88.0 bypass-routing interface so-1/2/2
>
> Works for me - until I managed to crash the M160 5 sec. later ;)

I don't have such an option on my JunOS [by chance.. so I cannot crash my
M20 .. :-))) ]

traceroute <desired destination> bypass-routing ?
Possible completions:
<[Enter]> Execute this command
gateway Gateway to route through
inet Force traceroute to IPv4 destination
inet6 Force traceroute to IPv6 destination
no-resolve Don't attempt to print addresses symbolically
routing-instance Routing instance for traceroute attempt
source Source address to use in outgoing traceroute packets
tos IP type-of-service field (IPv4) (0..255)
ttl IP time-to-live value (or IPv6 maximum hop-limit
value)
vpn-interface VPN interface for traceroute attempt (IPv4)
wait Time to wait for a response (seconds)
| Pipe through a command

Thanks!


Marco