Trace from a linux through MPLS cloud
Hi,
I got this trace from a customer.
1 10.50.128.254 1.940 ms 16.754 ms 16.482 ms
2 10.50.128.253 0.837 ms 0.733 ms 0.881 ms
3 192.168.105.181 4.040 ms 4.250 ms 3.982 ms
4 192.168.16.89 44.597 ms 44.532 ms 44.772 ms
MPLS Label=27 CoS=5 TTL=1 S=0
MPLS Label=129 CoS=3 TTL=1 S=0
5 192.168.18.141 15.380 ms 37.758 ms 10.681 ms
MPLS Label=129 CoS=5 TTL=1 S=0
6 192.168.18.142 23.174 ms * 22.015 ms
Can someone give me an explanation about the way linux box is able to find MPLS tags from the network?
The routers will include that information in the ICMP TTL expired messages according to the following draft:
"ICMP Extensions for MultiProtocol Label Switching"
http://www.ietf.org/proceedings/01mar/I-D/mpls-icmp-02.txt
It appears that Linux implements this draft too.
Hope this helps,
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Please go through the attached screen shots for the references and more clarity on the issues.
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I appologize if this has been covered but I dont see any exact hits...
We are working with our Service Provider to implement MPLS between our remote sites and main campus. We are currently using PtoP T1 in a hub and spoke model. We are running EIGRP in our entire environment.
We would like to continue to run EIGRP in our environment but the SP does not support this protocol through the cloud. I would prefer not to introduce any new routing protocols into our environment such as BGP. (I believe SP is running BGP).
I have read snippits that I can us e GRE tunnel between sites and send EIGRP routing updates via this tunnel.
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I will also have a need to send Multicast traffic between sites. I have read that GRE is the way to do this. To me it seems GRE will serve dual purposes.. first to allowing Dynamic routing updates between sites and also to allow Multicast traffic.
I appreciate any comments or suggestions!Hello Phil,
using GRE tunnels to build an overlay would deny one of the greatest benefits of MPLS L3 VPN: the peer model where each CE talks only with local PE node.
unless you have a small number of sites this approach is not recommended.
What if a new site is added in the future? you would need to configure a tunnel GRE to the new site in each of the existing sites.
You could run a DMVPN ( that is to use mGRE) to solve this but it has some complexity.
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router bgp 65001
neigh PE-address remote-as SP-AS-number
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! note:if auto-summary is disabled you need to provide the exact mask / prefix length
router eigrp 100
redistribute bgp 65001
default-metric 10000 1000 255 1 1500
! BW delay reliabilty load MTU
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TwoPointOh
I work on behalf of HP
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