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Creative Routing Contest

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chrismarget

Post subject: Re: Creative Routing Contest

Posted: Tue Apr 05, 2011 8:59 am

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Joined: Wed Jan 26, 2011 3:38 pm
Posts: 386
Location: New Hampshire

ristau5741 wrote:

MPLS won't work, you'll never see the hops in traceroute, because it's not layer3.

reaper wrote:

That depends if you do core hiding or not. You can choose the behaviour with mpls ip propagate-ttl.

Traceroute in an MPLS environment is especially neat/crazy.

Consider: If the TTL expires halfway across the P cloud, how can a P router get the error back to the packet originator? The P router doesn't have customer routes, so he doesn't know how to reach the origin system. He also doesn't know which PE router originated the MPLS payload because MPLS tags don't specify anything about "source", only the FEC (analogous to destination).

When the TTL expires on an MPLS tagged payload, the "TTL exceeded" message is sent along the FEC in the same direction as the original packet, away from the system that needs to hear the message. When it finally reaches the end PE router, it gets wrapped back up and kicked it into the FEC for the system that needs to receive the message (the guy running traceroute).

Every line in the traceroute output represents a full trip across the MPLS P cloud.

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Project2501

Post subject: Re: Creative Routing Contest

Posted: Tue Apr 05, 2011 9:21 am

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Joined: Thu Apr 17, 2008 6:44 pm
Posts: 6047
Location: Perth, WA
Certs: CCNA

ristau5741 wrote:

MPLS won't work, you'll never see the hops in traceroute, because it's not layer3.

I meant for MPLS to inject routing information not send the pay load

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ristau5741

Post subject: Re: Creative Routing Contest

Posted: Tue Apr 05, 2011 1:56 pm

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Joined: Tue Aug 21, 2007 2:15 pm
Posts: 8260
Location: Frederick MD
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reaper wrote:

That depends if you do core hiding or not. You can choose the behaviour with mpls ip propagate-ttl.

I shoulda known that.... back to the books....

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Steve

Post subject: Re: Creative Routing Contest

Posted: Tue Apr 05, 2011 7:11 pm

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

dlots entries 1 and 2 submitted.

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Steve

Post subject: Re: Creative Routing Contest

Posted: Wed Apr 06, 2011 9:57 am

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
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jacksonh submitted.

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chrismarget

Post subject: Re: Creative Routing Contest

Posted: Wed Apr 06, 2011 11:42 am

Senior Member

Joined: Wed Jan 26, 2011 3:38 pm
Posts: 386
Location: New Hampshire

Steve wrote:

The contest ends on 4/6/2011 at 2:00PM CST.

Will we see the results shortly after, or will judging take some time?

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Steve

Post subject: Re: Creative Routing Contest

Posted: Wed Apr 06, 2011 11:44 am

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
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Shouldn't take too long to judge.

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Steve

Post subject: Re: Creative Routing Contest

Posted: Wed Apr 06, 2011 2:17 pm

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
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Contest closed. Results pending.

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Steve

Post subject: Re: Creative Routing Contest

Posted: Wed Apr 06, 2011 2:51 pm

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

Ok, here's my solution using MPLS TE to take traffic from R1 -> R3 -> R2 over a tunnel, then from R2 -> R3 -> R4 over another tunnel, and then R4 -> R3 -> R5 over a third tunnel.

Code:

! ALL ROUTERS
mpls traffic-eng tunnels
!
router ospf 1
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
!
! ALL FASTETHERNET INTERFACES
 mpls ip
 mpls traffic-eng tunnels
 ip rsvp bandwidth 512 512

Code:

! ROUTER 1
interface Tunnel1
 ip unnumbered Loopback0
 tunnel destination 10.1.7.1
 tunnel mode mpls traffic-eng
 tunnel mpls traffic-eng priority 4 4
 tunnel mpls traffic-eng bandwidth  128
 tunnel mpls traffic-eng path-option 1 explicit name CREATIVE
 no routing dynamic
!
ip route 10.1.6.1 255.255.255.255 Tunnel1
!
ip explicit-path name CREATIVE enable
 next-address 10.1.8.1

Code:

! ROUTER 2
interface Loopback0
 ip address 10.1.7.1 255.255.255.255
!
interface Tunnel1
 ip unnumbered Loopback0
 tunnel destination 10.1.9.1
 tunnel mode mpls traffic-eng
 tunnel mpls traffic-eng priority 4 4
 tunnel mpls traffic-eng bandwidth  128
 tunnel mpls traffic-eng path-option 1 explicit name CREATIVE
 no routing dynamic
!
ip route 10.1.6.1 255.255.255.255 Tunnel1
!
ip explicit-path name CREATIVE enable
 next-address 10.1.8.1

Code:

! ROUTER 3
interface Loopback0
 ip address 10.1.8.1 255.255.255.255

Code:

! ROUTER 4
interface Loopback0
 ip address 10.1.9.1 255.255.255.255
!
interface Tunnel1
 ip unnumbered Loopback0
 tunnel destination 10.1.6.1
 tunnel mode mpls traffic-eng
 tunnel mpls traffic-eng priority 4 4
 tunnel mpls traffic-eng bandwidth  128
 tunnel mpls traffic-eng path-option 1 explicit name CREATIVE
 no routing dynamic
!
ip route 10.1.6.1 255.255.255.255 Tunnel1
!
ip explicit-path name CREATIVE enable
 next-address 10.1.8.1

Code:

R1#traceroute 10.1.6.1

Type escape sequence to abort.
Tracing the route to 10.1.6.1

  1 10.1.2.2 [MPLS: Label 20 Exp 0] 72 msec 124 msec 140 msec
  2 10.1.3.1 48 msec 36 msec 60 msec
  3 10.1.3.2 [MPLS: Label 21 Exp 0] 60 msec 60 msec 136 msec
  4 10.1.4.1 72 msec 68 msec 40 msec
  5 10.1.4.2 [MPLS: Label 22 Exp 0] 148 msec 212 msec 108 msec
  6 10.1.5.1 180 msec 396 msec *

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jdsilva

Post subject: Re: Creative Routing Contest

Posted: Wed Apr 06, 2011 2:53 pm

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Posts: 5148
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Certs: 350-001, CCNP, CXFF, ITILv3F

MPLS TE? Holy over-achiever!

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Steve

Post subject: Re: Creative Routing Contest

Posted: Wed Apr 06, 2011 2:56 pm

Site Admin

Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

Ha! I used Ian's blog post and some Cisco docs. The hardest part was figuring out I couldn't do it with one tunnel b/c the path is detected as invalid b/c it loops back on itself.

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Steve

Post subject: Re: Creative Routing Contest

Posted: Fri Apr 08, 2011 1:33 pm

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

I'll announce the winners Monday morning.

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ristau5741

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 10:57 am

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Joined: Tue Aug 21, 2007 2:15 pm
Posts: 8260
Location: Frederick MD
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Steve wrote:

I'll announce the winners Monday morning.

Which Monday morning ?

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Steve

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 2:23 pm

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

Sorry, working on this now. Pager had me up late and lots of tickets this morning.

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Steve

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 6:19 pm

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Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

Sorry again, we needed to clarify some things in the judging...the results are final.

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Steve

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 7:08 pm

Site Admin

Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

3rd place is dlots' 2nd submission.

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dlots

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 7:10 pm

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Joined: Mon Jun 15, 2009 9:48 am
Posts: 2871
Location: Lynchburg VA
Certs: CC\NP\DP\IP\NA-Security\NA-Voice

SWEET!!!

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Last edited by dlots on Mon Apr 11, 2011 7:57 pm, edited 1 time in total.

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dlots

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 7:19 pm

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Joined: Mon Jun 15, 2009 9:48 am
Posts: 2871
Location: Lynchburg VA
Certs: CC\NP\DP\IP\NA-Security\NA-Voice

can't wait to see the top 2 :-D

they gonna be posted for us to gander at?

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Freedom to all the people. Unless I think you're wrong

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Steve

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 7:58 pm

Site Admin

Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

Here is dlots 3rd place winning submission:

Code:

hostname R1

interface Loopback0
 ip address 10.1.1.1 255.255.255.255
!
interface Tunnel1
 ip address 1.1.1.1 255.255.255.0
 tunnel source FastEthernet0/0
 tunnel destination 10.1.3.1
!
interface FastEthernet0/0
 description R3 F0/0
 ip address 10.1.2.1 255.255.255.0

router eigrp 1
 network 1.1.1.0 0.0.0.255
 network 10.1.1.1 0.0.0.0
 no auto-summary

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

Code:

hostname R2
!
interface Tunnel0
 ip address 1.1.1.2 255.255.255.0
 tunnel source FastEthernet0/0
 tunnel destination 10.1.2.1
!
interface Tunnel1
 ip address 2.2.2.2 255.255.255.0
 tunnel source FastEthernet0/0
 tunnel destination 10.1.3.2
!
interface FastEthernet0/0
 description R3 F0/1
 ip address 10.1.3.1 255.255.255.0

router eigrp 1
 network 1.1.1.0 0.0.0.255
 network 2.2.2.0 0.0.0.255
 no auto-summary

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

Code:

hostname R3
!
interface Tunnel0
 ip address 2.2.2.3 255.255.255.0
 tunnel source FastEthernet0/1
 tunnel destination 10.1.3.1
!
interface Tunnel1
 ip address 3.3.3.3 255.255.255.0
 tunnel source FastEthernet1/0
 tunnel destination 10.1.4.1
!
interface FastEthernet0/0
 description R1 F0/0
 ip address 10.1.2.2 255.255.255.0
 
!
interface FastEthernet0/1
 description R2 F0/0
 ip address 10.1.3.2 255.255.255.0
 
interface FastEthernet1/0
 description R4 F0/0
 ip address 10.1.4.2 255.255.255.0
 
interface FastEthernet2/0
 description R5 F0/0
 ip address 10.1.5.2 255.255.255.0
 
router eigrp 1
 network 2.2.2.0 0.0.0.255
 network 3.3.3.0 0.0.0.255
 no auto-summary

Code:

hostname R4

interface Tunnel0
 ip address 3.3.3.4 255.255.255.0
 tunnel source FastEthernet0/0
 tunnel destination 10.1.4.2
!
interface Tunnel1
 ip address 4.4.4.4 255.255.255.0
 tunnel source FastEthernet0/0
 tunnel destination 10.1.5.1
!
interface FastEthernet0/0
 description R3 F1/0
 ip address 10.1.4.1 255.255.255.0

router eigrp 1
 network 3.3.3.0 0.0.0.255
 network 4.4.4.0 0.0.0.255
 no auto-summary

ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

Code:

hostname R5

interface Loopback0
 ip address 10.1.6.1 255.255.255.255

interface Tunnel0
 ip address 4.4.4.5 255.255.255.0
 tunnel source FastEthernet0/0
 tunnel destination 10.1.4.1
!
interface FastEthernet0/0
 description R3 F2/0
 ip address 10.1.5.1 255.255.255.0
 
router eigrp 1
 network 4.4.4.0 0.0.0.255
 network 10.1.6.0 0.0.0.255
 no auto-summary
!
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

NO TRACEROUTE PROVIDED.

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Steve

Post subject: Re: Creative Routing Contest

Posted: Mon Apr 11, 2011 8:03 pm

Site Admin

Joined: Mon Dec 06, 2004 6:46 pm
Posts: 10261
Location: McKinney, TX
Certs: CCNA

The 2nd place winner is...

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