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uniqs
3140

ArrayList
DevOps
Premium Member
join:2005-03-19
Mullica Hill, NJ

ArrayList to EG

Premium Member

to EG

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

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
Grand Rapids, MI

depster to whfsdude

Member

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?

NetFixer
From My Cold Dead Hands
Premium Member
join:2004-06-24
The Boro
Netgear CM500
Pace 5268AC
TRENDnet TEW-829DRU

NetFixer to JohnInSJ

Premium Member

to JohnInSJ
said by JohnInSJ:

said by NathanO:

That is Comcast's anycast DNS

Perhaps using one from here »www.whatsmydns.net/dns/u ··· ast.html

...

Would yield different CDN entry points?

That is exactly what I do for the forwarding servers in my in-house DNS server. I chose the primary servers for Atlanta and Chicago because most of my routes go through either Atlanta or Chicago.





C:\>dig -x 68.87.68.162
 
; <<>> DiG 9.9.2 <<>> -x 68.87.68.162
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62426
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;162.68.87.68.in-addr.arpa.     IN      PTR
 
;; ANSWER SECTION:
162.68.87.68.in-addr.arpa. 1196 IN      PTR     nrcns.s3woodstock.ga.atlanta.comcast.net.
 
;; Query time: 31 msec
;; SERVER: 192.168.9.2#53(192.168.9.2)
;; WHEN: Sun Jan 27 13:11:54 2013
;; MSG SIZE  rcvd: 108
 
C:\>dig -x 68.87.72.130
 
; <<>> DiG 9.9.2 <<>> -x 68.87.72.130
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26004
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
 
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1280
;; QUESTION SECTION:
;130.72.87.68.in-addr.arpa.     IN      PTR
 
;; ANSWER SECTION:
130.72.87.68.in-addr.arpa. 6112 IN      PTR     nrcns.area4.il.chicago.comcast.net.
130.72.87.68.in-addr.arpa. 6112 IN      PTR     chic-cns.area4.il.chicago.comcast.net.
 
;; Query time: 15 msec
;; SERVER: 192.168.9.2#53(192.168.9.2)
;; WHEN: Sun Jan 27 13:12:24 2013
;; MSG SIZE  rcvd: 125
 

makaze
Premium Member
join:2004-02-23
USA

1 recommendation

makaze to depster

Premium Member

to depster
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
Ann Arbor, MI

johnnn

Member

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.