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MICE-DISCUSS  June 2018

MICE-DISCUSS June 2018

Subject:

Re: Not learning all routes from RR#2

From:

Frank Bulk <[log in to unmask]>

Reply-To:

MICE Discuss <[log in to unmask]>

Date:

Thu, 28 Jun 2018 04:06:26 +0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (194 lines)

Thanks for the feedback.  

Interface MTU is showing 1500 bytes.  Traffic is running -- peering with others without any known issues.
This "received unexpected EOF" in the "show ip bgp neighbors 206.108.255.2" jumps out at me, but my google-fu doesn't reveal anything obvious other than a hint at a TCP checksum issue.  

Resetting the session again (not the first time) has appeared to resolve it.

Interesting that IPv6 is showing a count discrepancy, too:

  2001:504:27::d1af:0:1 4  53679          49967      7442    0    0 20:39:29 Estab  2199   2199
  2001:504:27::d1af:0:2 4  53679          49962      7442    0    0 20:39:21 Estab  8993   8993


SiouxCenter-Arista-North(s1)#show int e 3/24
Ethernet3/24 is up, line protocol is up (connected)
  Hardware is Ethernet, address is 001c.73d7.6391
  Description: to MICE cia CYAN 7/4
  Internet address is 206.108.255.67/24
  Broadcast address is 255.255.255.255
  IPv6 link-local address is fe80::21c:73ff:fed7:6391/64
  IPv6 global unicast address(es):
    2001:504:27::d063:0:1, subnet is 2001:504:27::/64
  IP MTU 1500 bytes , BW 10000000 kbit
  Full-duplex, 10Gb/s, auto negotiation: off, uni-link: disabled
  Up 21 hours, 29 minutes, 16 seconds
  Loopback Mode : None
  5 link status changes since last clear
  Last clearing of "show interface" counters never
  30 seconds input rate 1.85 Gbps (18.8% with framing overhead), 168059 packets/sec
  30 seconds output rate 285 Mbps (3.0% with framing overhead), 118650 packets/sec
     9241433949 packets input, 12515818295584 bytes
     Received 1960477 broadcasts, 5282001 multicast
     0 runts, 0 giants
     0 input errors, 0 CRC, 0 alignment, 0 symbol, 0 input discards
     0 PAUSE input
     7518589614 packets output, 2302004527878 bytes
     Sent 373 broadcasts, 17753 multicast
     0 output errors, 0 collisions
     0 late collision, 0 deferred, 0 output discards
     0 PAUSE output
SiouxCenter-Arista-North(s1)#

SiouxCenter-Arista-North(s1)#show ip bgp neighbors 206.108.255.2
BGP neighbor is 206.108.255.2, remote AS 53679, external link
  Description: MICE_RR_#2
  BGP version 4, remote router ID 206.108.255.2, VRF default
  Negotiated BGP version 4
  Last read 00:00:05, last write 00:00:01
  Hold time is 30, keepalive interval is 10 seconds
  Configured hold time is 30, keepalive interval is 10 seconds
  Connect timer is inactive
  Idle-restart timer is inactive
  BGP state is Established, up for 21:10:51
  Number of transitions to established: 3
  Last state was OpenConfirm
  Last event was RecvKeepAlive
  Last rcvd notification:Cease/maximum number of prefixes reached, Last time 21:28:28
  Last rcvd socket-error:received unexpected EOF, Last time 21:23:42, First time 21:26:16, Repeats 7
  Neighbor Capabilities:
    Multiprotocol IPv4 Unicast: advertised and received and negotiated
    Four Octet ASN: advertised and received
    Route Refresh: advertised and received and negotiated
    Send End-of-RIB messages: advertised and received and negotiated
    Additional-paths recv capability:
      IPv4 Unicast: advertised
    Graceful Restart advertised:
       Restart-time is 300
       Restarting: no
       IPv4 Unicast is enabled, Forwarding State is not preserved
  Restart timer is inactive
  End of rib timer is inactive
  Message Statistics:
    InQ depth is 0
    OutQ depth is 0
                         Sent      Rcvd
    Opens:                 18         3
    Notifications:          0         1
    Updates:             3426     44814
    Keepalives:          7629      8472
    Route-Refresh:          0         0
    Total messages:     11073     53290
  Prefix Statistics:
                         Sent      Rcvd
    IPv4 Unicast:          50     11660
    IPv6 Unicast:           0         0
    IPv4 SR-TE:             0         0
    IPv6 SR-TE:             0         0
  Inbound updates dropped by reason:
    AS path loop detection: 0
    Enforced First AS: 10746
    Originator ID matches local router ID: 0
    Nexthop matches local IP address: 0
    Unexpected IPv6 nexthop for IPv4 routes: 0
    Nexthop invalid for single hop eBGP: 0
  Inbound updates with attribute errors:
    Resulting in removal of all paths in update (treat-as-withdraw): 0
    Resulting in AFI/SAFI disable: 0
    Resulting in attribute ignore: 0
  Inbound paths dropped by reason:
    IPv4 labeled-unicast NLRIs dropped due to excessive labels: 0
    IPv6 labeled-unicast NLRIs dropped due to excessive labels: 0
  Outbound paths dropped by reason:
    IPv4 local address not available: 0
    IPv6 local address not available: 0
  Inbound route map is MICE_INBOUND
  Inbound prefix list for IPv4 unicast is PREMIER_IN_FROM_MICEv4
  Outbound prefix list for IPv4 unicast is PREMIER_OUT_TO_MICEv4
Local AS is 53347, local router ID 207.32.15.22
TTL is 1
Local TCP address is 206.108.255.67, local port is 179
Remote TCP address is 206.108.255.2, remote port is 23143
Auto-Local-Addr is disabled
TCP Socket Information:
  TCP state is ESTABLISHED
  Recv-Q: 0/32768
  Send-Q: 0/32768
  Outgoing Maximum Segment Size (MSS): 1448
  Total Number of TCP retransmissions: 0
  Options:
    Timestamps enabled: yes
    Selective Acknowledgments enabled: yes
    Window Scale enabled: yes
    Explicit Congestion Notification (ECN) enabled: no
  Socket Statistics:
    Window Scale (wscale): 6,7
    Retransmission Timeout (rto): 312.0ms
    Round-trip Time (rtt/rtvar): 108.6ms/2.2ms
    Delayed Ack Timeout (ato): 40.0ms
    Congestion Window (cwnd): 10
    TCP Throughput: 1.07 Mbps
    Recv Round-trip Time (rcv_rtt): 64.0ms
    Advertised Recv Window (rcv_space): 28960


SiouxCenter-Arista-North(s1)#


Frank

-----Original Message-----
From: MICE Discuss <[log in to unmask]> On Behalf Of Jeremy Lumby
Sent: Wednesday, June 27, 2018 7:34 PM
To: [log in to unmask]
Subject: Re: [MICE-DISCUSS] Not learning all routes from RR#2

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 

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