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Anthony mentioned MTU.  I have had issues in the past with BGP, and larger MTUs.  Especially when my router had a larger MTU than the path/destination router.  BGP would establish, get a few prefixes, and then time out.  I just took a look, and the route servers have a 1500 MTU.  Are you set larger?

-----Original Message-----
From: MICE Discuss [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Wednesday, June 27, 2018 5:32 PM
To: [log in to unmask]
Subject: Re: [MICE-DISCUSS] Not learning all routes from RR#2

The two MICE-attached routers I'm responsible for look OK, and about the same as they have looked recently:
206.108.255.1   4        53679 10130010  700710 305989456    0    0 1y11w       56003
206.108.255.2   4        53679 9531122  656345 305989456    0    0 1y7w        56001
--
206.108.255.1     0 53679 14571189  909087 587718403    0    0    46w5d      55942
206.108.255.2     0 53679 14593796  908792 587718403    0    0    46w5d      55940

The MICE Looking Glass seems about the same:
telnet://rviews:@[log in to unmask]:23
206.108.255.1   4        53679 5001870  255450 11721640    0    0 23w0d       56004
206.108.255.2   4        53679 4998551  255464 11721640    0    0 23w0d       56002

The "no bgp enforce-first-as"  config is expected on some platforms:
http://www.micemn.net/technical.html

Is traffic flowing normally otherwise?  Perhaps you're running into an L1/L2 or MTU issue such that this is a symptom of another problem?

Cheers,
anthony

-----Original Message-----
From: MICE Discuss [mailto:[log in to unmask]] On Behalf Of Frank Bulk
Sent: Wednesday, June 27, 2018 1:25 PM
To: [log in to unmask]
Subject: [MICE-DISCUSS] Not learning all routes from RR#2

We (AS53347) moved to a new border router overnight and had some issues with getting our MICE route reflector peerings up -- we'd learn a route or two per second.  We had to tweak our Arista's BGP configuration to not "enforce-first-as".  Most other direct peers were fine.

Eventually RR #1 came up just fine, but RR #2 continues to languish, learning just learning about 10,900 routes.

SiouxCenter-Arista-North(s1)#show ip bgp sum
BGP summary information for VRF default
Router identifier 207.32.15.22, local AS number 18883
Neighbor Status Codes: m - Under maintenance
  Neighbor         V  AS           MsgRcvd   MsgSent  InQ OutQ  Up/Down State  PfxRcd PfxAcc
  206.108.255.1    4  53679          44493      4138    0    0 10:56:46 Estab  56188  56188
  206.108.255.2    4  53679          39124      7640    0    0 11:38:40 Estab  10929  10929

I'm not sure if we have remote access to the RR's, but whoever does, any hints as to why we're experiencing this behavior?

Frank