Hey Saku, > Saku Ytti [mailto:s...@ytti.fi] > Sent: Thursday, September 29, 2016 12:30 PM > > On 29 September 2016 at 10:09, Adam Vitkovsky > <adam.vitkov...@gamma.co.uk> wrote: > > Since Junos can't generate update msg based on commonalities in egress > policies (i.e. "dynamic update peer-groups"), I believe it will put each > neighbour in its own update-group and generate update message for each > peer independently, even though multiple peers might request the same set > of RTs (i.e. have same set of egress policies). > > I don't believe this is true. > > You can do show 'show bgp group | match Name' and you should see which > neighbours are part of same update-group. You may have several update- > groups with same Name but different index and different set of neighbours. >
You got me thinking so I did a little test, details below. Conclusion: The automatic grouping based on commonalities in egress policies works only within a group but not between groups. Also within a group, if peer is configured with unique export policies and thus moved to its own update group the peer is bounced. So with regards to Johan's case, if he has all the peers in one group, then the "update-grouping" should actually work, although if it does, then peers might flap spontaneously as they are being moved from one group to the other (when PEs are configured with new RTs). If he defined unique group for each peer, then update-grouping wasn't there in the first place so nothing to lose nothing to gain (possibly except the stability when export policies are changed). So yeah worth testing in the lab first. set protocols bgp group test type external set protocols bgp group test family inet unicast set protocols bgp group test export pe-loopbacks set protocols bgp group test peer-as 64512 set protocols bgp group test neighbor 1.1.1.1 > show bgp group test Group Type: External Local AS: 31655 Name: test Index: 1 Flags: <> Export: [ pe-loopbacks ] Holdtime: 0 Total peers: 1 Established: 1 1.1.1.1 Trace options: all Trace file: /var/log/bgp-trace size 131072 files 10 set protocols bgp group test neighbor 2.2.2.2 > show bgp group test Group Type: External Local AS: 31655 Name: test Index: 1 Flags: <> Export: [ pe-loopbacks ] Holdtime: 0 Total peers: 2 Established: 2 1.1.1.1 2.2.2.2 Trace options: all Trace file: /var/log/bgp-trace size 131072 files 10 set protocols bgp group test neighbor 2.2.2.2 export DEFAULT_ORIGINATE_EX 2.2.2.2 -will bounce > show bgp group test Group Type: External Local AS: 31655 Name: test Index: 1 Flags: <> Export: [ pe-loopbacks ] Holdtime: 0 Total peers: 1 Established: 1 1.1.1.1 Trace options: all Trace file: /var/log/bgp-trace size 131072 files 10 Group Type: External Local AS: 31655 Name: test Index: 10 Flags: <> Export: [ DEFAULT_ORIGINATE_EX ] Holdtime: 0 Total peers: 1 Established: 0 2.2.2.2 Trace options: all Trace file: /var/log/bgp-trace size 131072 files 10 set protocols bgp group test neighbor 1.1.1.1 export DEFAULT_ORIGINATE_EX 1.1.1.1 -will bounce > show bgp group test Group Type: External Local AS: 31655 Name: test Index: 10 Flags: <> Export: [ DEFAULT_ORIGINATE_EX ] Holdtime: 0 Total peers: 2 Established: 1 1.1.1.1 2.2.2.2 Trace options: all Trace file: /var/log/bgp-trace size 131072 files 10 del protocols bgp group test neighbor 2.2.2.2 set protocols bgp group test2 type external set protocols bgp group test2 family inet unicast set protocols bgp group test2 export pe-loopbacks set protocols bgp group test2 peer-as 64512 set protocols bgp group test2 neighbor 2.2.2.2 export DEFAULT_ORIGINATE_EX show bgp group test Group Type: External Local AS: 31655 Name: test Index: 10 Flags: <> Export: [ DEFAULT_ORIGINATE_EX ] Holdtime: 0 Total peers: 1 Established: 1 1.1.1.1 Trace options: all Trace file: /var/log/bgp-trace size 131072 files 10 Group Type: External Local AS: 31655 Name: test2 Index: 1 Flags: <> Export: [ DEFAULT_ORIGINATE_EX ] Holdtime: 0 Total peers: 1 Established: 0 2.2.2.2 Trace options: all Trace file: /var/log/bgp-trace size 131072 files 10 adam Adam Vitkovsky IP Engineer T: 0333 006 5936 E: adam.vitkov...@gamma.co.uk W: www.gamma.co.uk This is an email from Gamma Telecom Ltd, trading as “Gamma”. The contents of this email are confidential to the ordinary user of the email address to which it was addressed. This email is not intended to create any legal relationship. No one else may place any reliance upon it, or copy or forward all or any of it in any form (unless otherwise notified). If you receive this email in error, please accept our apologies, we would be obliged if you would telephone our postmaster on +44 (0) 808 178 9652 or email postmas...@gamma.co.uk Gamma Telecom Limited, a company incorporated in England and Wales, with limited liability, with registered number 04340834, and whose registered office is at 5 Fleet Place London EC4M 7RD and whose principal place of business is at Kings House, Kings Road West, Newbury, Berkshire, RG14 5BY. --------------------------------------------------------------------------------------- This email has been scanned for email related threats and delivered safely by Mimecast. For more information please visit http://www.mimecast.com --------------------------------------------------------------------------------------- _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp