Hello,
JUNOS does not have regex backreference, unlike IOS.
My regex matches not the same community N+1 times but ANY standard
community N+1 times, all unique or all repeating or some unique & some
repeating.
Thanks
Alex
On 24/08/2016 06:47, Huan Pham wrote:
Hi Alex,
I am pretty sure, you will never see the same community twice (unlike
AS in AS-PATH). So your regex to match multiple occurrences of a
community is not necessary.
On Wednesday, August 24, 2016, Alexander Arseniev
<arsen...@btinternet.com <mailto:arsen...@btinternet.com>> wrote:
Hello,
JUNOS allows You to use regex with communities
https://www.juniper.net/techpubs/en_US/junos16.1/topics/usage-guidelines/policy-defining-bgp-communities-and-extended-communities-for-use-in-routing-policy-match-conditions.html
<https://www.juniper.net/techpubs/en_US/junos16.1/topics/usage-guidelines/policy-defining-bgp-communities-and-extended-communities-for-use-in-routing-policy-match-conditions.html>
So if You want to restrict ANY community value to no more than N
occurences, then
set policy-options community no-more-than-N-only members
"^(.*):(.*){N+1,}$"
- and matching it in the BGP import policy should do the job.
And I never tested it myself...
You may need to construct another regex for extended communities
though.
HTH
Thx
Alex
On 23/08/2016 14:04, James Bensley wrote:
On 23 August 2016 at 13:40, Olivier Benghozi
<olivier.bengh...@wifirst.fr> wrote:
And about a limitation to 10 communities:
I've seen that on SEOS (Redback/Ericsson OS for SmartEdge
routers) when using "set community" in a route-map. This
is a ridiculous arbitrary limitation, of course.
Hopefully the limitation was only in the CLI, not in the
BGP code itself. So the workaround was to use the
route-map "continue" command like in a BASIC GOTO
structure to add more communities in additional route-map
entries (with set community additive - these are
Cisco-like commands).
Le 23 août 2016 à 14:03, Alexander Arseniev
<arsen...@btinternet.com> a écrit :
In BGP messages, a regular community is encoded in 7
bytes, and extended one in 11 bytes.
Max BGP message size is 4096 bytes - this sets a limit
for regular communities number to about 4K/7=570, and
for extended communities to about 4K/11=360, if You
consider the minimal mandatory information that has to
be there apart from communities.
On 23/08/2016 03:18, Huan Pham wrote:
I remember hitting a limit on a number of
communities (something like 10 or
so) on a platform (can not remember which one from
which vendor). So I
believe that there is a hard limit a platform or
OS can support.
I test this in the lab and found no problem with
tagging 100 communities.
Is there a maximum number of communities that
Junos can tag to a route? If
yes, then what it is? Thanks.
Hi,
Hopefully not completely hijacking this thread; I'm interested
to know
if there is a way I can limit a peer to a maximum number of
communities?
Cheers,
James.
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