[j-nsp] Segment Routing Real World Deployment (was: VPC mc-lag)

[Mark Tinka]

On 10/Jul/18 12:39, Saku Ytti wrote:

> I'd say this is true if you compare full-mesh iBGP and LDP, if you
> compare RR iBGP and LDP, it's not true, RR iBGP has signalling
> redundancy LDP does not have.

Agreed on that point.

Perhaps an option for the LDP heads is LDP Session Protection, which is
supported by the major vendors. I don't use it in my network, though.

Again, my main focus is maintaining a super stable IGP, one that can
converge quickly enough for the upper-layer protocols (and data plane)
not to notice. Features in upper-layer protocols that speed up
convergence are also exploited in my network to ensure data plane
changes happen as quickly (but as simply) as possible, e.g., the
Indirect Next Hop feature.

As an example, below is a revenue-generating p2p LDP-based EoMPLS
circuit that has been up 46.5 weeks:

tinka at device-re0# run show l2circuit connections neighbor aaa.bb.c.129
extensive
<snip>
...
Neighbor: aaa.bb.c.129
    Interface                 Type  St     Time last up          # Up trans
    ae2.62(vc 22)             rmt   Up     Aug 18 23:59:44 2017           1
<snip>
...
    Connection History:
        *Aug 18 23:59:44 2017  status update timer**
**        Aug 18 23:59:43 2017  PE route changed**
**        Aug 18 23:59:43 2017  Out lbl Update                    299776**
**        Aug 18 23:59:43 2017  In lbl Update                     299824**
**        Aug 18 23:59:43 2017  loc intf up                       ae2.62*

{master}[edit]
tinka at device-re0#

tinka at device-re0# run show ldp session aaa.bb.c.129 extensive
Address: aaa.bb.c.129, State: Operational, Connection: Open, Hold time: 27
<snip>
...
 *Up for 46w3d 11:12:55*
  *Last down 46w3d 11:12:59 ago*; Reason: received notification from peer
  Capabilities advertised: p2mp, make-before-break
  Capabilities received: p2mp, make-before-break
  Protection: disabled
  Session flags: none
<snip>
...
{master}[edit]
tinka at device-re0#

Have the backbone links carrying this pw been 46.5 weeks stable? That's
a firm NO!

Mark.