dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
45
share rss forum feed


depster

join:2001-06-07
united state
reply to johnnn

Re: [Speed] Congested Comcast Peering with Akamai, Google in Mid

It may be that your local router is being upgraded... in your first post Hop 3 indicated a 'te' interface.

When I just tracerouted to it now, it's showing as a 'xe' interface.

  3    20 ms    10 ms    10 ms  96.120.41.137
  4    12 ms     7 ms     7 ms  xe-8-2-0-sur01.grandrapids.mi.michigan.comcast.net [68.86.140.185]
  5    17 ms    19 ms    27 ms  te-0-2-0-4-ar01.taylor.mi.michigan.comcast.net [69.139.254.29]
  6    18 ms    17 ms    19 ms  xe-7-3-0-sur01.wannarbor.mi.michigan.comcast.net [68.85.218.201]
 


DrDrew
That others may surf
Premium
join:2009-01-28
SoCal
kudos:15

said by depster:

It may be that your local router is being upgraded... in your first post Hop 3 indicated a 'te' interface.

When I just tracerouted to it now, it's showing as a 'xe' interface.

  3    20 ms    10 ms    10 ms  96.120.41.137
  4    12 ms     7 ms     7 ms  xe-8-2-0-sur01.grandrapids.mi.michigan.comcast.net [68.86.140.185]
  5    17 ms    19 ms    27 ms  te-0-2-0-4-ar01.taylor.mi.michigan.comcast.net [69.139.254.29]
  6    18 ms    17 ms    19 ms  xe-7-3-0-sur01.wannarbor.mi.michigan.comcast.net [68.85.218.201]
 

It's a different interface of the same router. OP's being from the edge of the network inbound, yours being from the core of the network outbound.
--
Two is one, one is none. If it's important, back it up... Somethimes 99.999% availability isn't even good enough.

johnnn

join:2007-01-25
Ypsilanti, MI

DrDrew is right. When I do tracerts *to* the edge they travel through an xe interface.



EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10

1 edit

3 recommendations

reply to depster

FWIW, just a point. As Dr.Drew stated, it's the same physical router. This data needs to also be examined when evaluating the rDNS info on hops;

te-8-2-ur02
xe-7-0-sur01

Even though the IP address is the same, the slot, port, and ring data is different.

Some examples of some meanings;

Some examples;

ge = gigabit ethernet.

te / xe= ten gigabit ethernet.

p, po, pos = Packet Over Sonet (an OC-3 or faster connection).

XE / TE = Juniper / Cisco 10GigE Interface
be / ae = Cisco Bundle Ethernet / Juniper Aggregate Ethernet

he = hundred gigabit ethernet.

1-1, 1-2, 1-11, 6-1, 9-1, 2-2, etc. = slot and port.

ar01, cr01, ur01

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.


johnnn

join:2007-01-25
Ypsilanti, MI

EG, you're the best.



EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10

I doubt that but thanks for your kind words !



whfsdude
Premium
join:2003-04-05
Washington, DC
Reviews:
·Comcast
reply to EG

said by EG:

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

The one I've never understood is "SUR." I have yet to see this interface name used outside of Comcast. Happen to know?

johnnn

join:2007-01-25
Ypsilanti, MI

Click for full size
New interface on the
Click for full size
KS route
Click for full size
CA route
Click for full size
Peak time comparison
There appear to be significant changes underway. One of the routers hostnames has reappeared, and I'm on a different interface. A hop prior to Pontiac has been eliminated from the previous configuration.

There was likely some sort of maintenance window on Friday morning as evidenced by the smokeping graphs attached (this makes sense, as it corresponds with the lowest utilization period for the college town I'm in). Comparing the ICMP performance for peak windows between this week and last, there's been a significant improvement.


ArrayList
netbus developer
Premium
join:2005-03-19
Brighton, MA
Reviews:
·RCN CABLE
·Comcast
reply to EG

said by EG:

ge = gigabit ethernet.

te / xe= ten gigabit ethernet.

p, po, pos = Packet Over Sonet (an OC-3 or faster connection).

XE / TE = Juniper / Cisco 10GigE Interface
be / ae = Cisco Bundle Ethernet / Juniper Aggregate Ethernet

he = hundred gigabit ethernet.

1-1, 1-2, 1-11, 6-1, 9-1, 2-2, etc. = slot and port.

ar01, cr01, ur01

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

holy cow man. Thanks for this information. I know it's pretty trivial for non-comcast network engineers, but it really helps add some light into where my packets go when they leave town.


depster

join:2001-06-07
united state
reply to whfsdude

said by whfsdude:

said by EG:

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

The one I've never understood is "SUR." I have yet to see this interface name used outside of Comcast. Happen to know?

Maybe Switched User Ring?

makaze
Premium
join:2004-02-23
USA

1 recommendation

said by depster:

said by whfsdude:

said by EG:

User Ring (UR), Area Ring (AR), Core Ring (CR) routing.

The one I've never understood is "SUR." I have yet to see this interface name used outside of Comcast. Happen to know?

Maybe Switched User Ring?

Nah it's a Super UR. In most areas it's a juniper with multiple AR connections for redundancy.

johnnn

join:2007-01-25
Ypsilanti, MI

So based on the info in this thread, the changes in throughput (things are much improved), and the routing changes I've observed, it looks like Comcast hooked my neighborhood's CMTS (and likely all of wannarbor) into a Super UR whereas before it routed through two regular 10GigE URs on its way to the AR in Pontiac.