Re: Juniper advertises ::/0 Cisco hears ::/3

[gwoo...@gmail.com]

Very interesting.  Do you know what platform and code the Juniper side on L3 is 
running?

Sent from my HTC on the Now Network from Sprint!

- Reply message -
From: Ben Bartsch uwcable...@gmail.com
Date: Fri, May 11, 2012 6:29 pm
Subject: Juniper advertises ::/0 Cisco hears ::/3
To: nanog@nanog.org

This one is very strange...

Has anyone seen this behavior with BGP IPv6 between Juniper (owned by Level
3, advertising routes correctly, sending default ::/0) and Cisco (6509
running 12.2.58.SXI6 advipservices, receiving all routes fine except
default, hearing ::/3)?  I worked with Level 3 and they confirmed they are
sending ::/0 as default:

show route advertising-protocol bgp 2001:1900:2100::XXX



inet6.0: 11139 destinations, 43712 routes (11135 active, 0 holddown, 7
hidden)

  Prefix  Nexthop  MED LclprefAS path

* ::/0SelfI


We see a ::/3:

XXX#sh ip bgp ipv6 uni neigh 2001:1900:2100::XXX received-r

BGP table version is 497237119, local router ID is XXX.XX.XX.

Status codes: s suppressed, d damped, h history, * valid,  best, i -
internal,

  r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete



   Network  Next HopMetric LocPrf Weight Path

* ::/3 2001:1900:2100::XXX

   0 3356 i

I opened a TAC case and they had me run some IPv6 BGP detailed debugging
which confirmed we are receiving a ::/3

*May* *11* *18:01:07* *XXX* *67205:* *May* *11* *18:01:05.701* *CDT:
* *BGP*(*1*)*:* *process* *::/3*, *next* *hop* *2001:1900:2100::XXX* (*
FE80:::::*), *metric* *0* *from* *2001:1900:2100::XXX*

Cisco's next step is for us to Wireshark the interface.  I have requested
Level 3 engage Juniper TAC, but am not expecting them to come up with
anything since they already confirmed they are sending ::/0.

We have a second connection to Level 3 that is Cisco - Cisco and it is
working fine.  My gut says this is one of those Juniper - Cisco
communications issues, but I need proof.

I am just curious if anyone has seen this type of behavior.  Have a great
weekend.

-Ben

Re: Switch designed for mirroring tap ports

[gwoo...@gmail.com]

Instead of monitoring the physical interface, monitor the vlan from a Cisco IOS 
perspective on a CAT6500.  This will capture all physical interfaces associated 
with that vlan for mirroring/span.

HTH

Jonathan
#22744

Sent from my HTC on the Now Network from Sprint!

- Reply message -
From: A. Pishdadi apishd...@gmail.com
Date: Wed, Feb 29, 2012 11:12 pm
Subject: Switch designed for mirroring tap ports
To: NANOG nanog@nanog.org

Hello All,

We are looking for a switch or a device that we can use for mirroring tap
ports. For example , take a mirror port off of a core router say a 6509,
connect it to a port on said device, say port 1. I would like then to be
able to mirror port 1 on said device to multiple ports,  like port 2 , 3,
4. We have the need to analyze traffic from one port on multiple devices.
Seems most switches are limited to mirroring to a max of 1 or 2 ports.


Any suggestions would be great.

Thanks,
Ameen