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OSPF sham link and vlink

OSPF sham link and vlink

Created: Dec 25, 2019 12:18:55Latest reply: Dec 27, 2019 06:24:29 335 2 0 0
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Hello guys, 

I am preparing the HCIE exam these days, and I found a feature named sham link in the webpage. I checked the documentation, it says 'OSPF sham links are IP unnumbered P2P links between two PE devices on an MPLS VPN backbone network. Generally, BGP peers use BGP extended community attributes to carry routing information over the MPLS VPN backbone. OSPF running on a PE device can use the routing information to generate inter-area routes from the PE to CE devices'.

ospf sham link


It seems sham link works as same with the v-link in OSPF, so do you guys have any idea about the difference between them?

Thanks for any suggestions.


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chenhui
Admin Created Dec 25, 2019 12:27:08 Helpful(1) Helpful(1)

@user_3445655 Hi,
As you thought, sham link is quite similar with vlink in some way. Both of them are used to connect two OSPF areas. But actually, they are quite different from each other. For sham link, it is used to connect another OSPF area across MPLS VPN backbone, as displayed in your figure.
For vlink, it connects the sperated OSPF area 0 across OSPF non-backbone area.
On the other hand, the sperated areas connected by the sham link or vlink could be considered as a whole area.

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chenhui
chenhui Admin Created Dec 25, 2019 12:27:08 Helpful(1) Helpful(1)

@user_3445655 Hi,
As you thought, sham link is quite similar with vlink in some way. Both of them are used to connect two OSPF areas. But actually, they are quite different from each other. For sham link, it is used to connect another OSPF area across MPLS VPN backbone, as displayed in your figure.
For vlink, it connects the sperated OSPF area 0 across OSPF non-backbone area.
On the other hand, the sperated areas connected by the sham link or vlink could be considered as a whole area.

View more
  • x
  • convention：
user_3445655
user_3445655 Created Dec 27, 2019 06:24:29 Helpful(0) Helpful(0)

Posted by chenhui at 2019-12-25 12:27 @user_3445655 hi,As you thought, sham link is quite similar with vlink in some way. Both of them are ...
OK, thanks chenhui.
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