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BGP Error

promise2k
Level 1
Level 1

i wanted to perform a swap of my BGP router i.e from ASR-1001 to ASR-1001-X. since this is a swap all configuration remained the same, nothing changed. when i plugged in the new router by e-BGP was not coming up. i was getting the below error message

BGP-4-MSGDUMP: unsupported or mal-formatted message received from x.x.x.x:
FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF 0055 0104 3DBA 00B4 0A2C 110F 3802 0601
0400 0100 0102 0280 0002 0202 0002 0641 0400 003D BA02 0840 0600 7800 0101 0002
1405 1200 0100 0100 0200 0100 0200 0200 0100 8000 02

 

below is the BGP config which i have 

 

router bgp zzzzz

 bgp router-id 10.254.3.1

 bgp always-compare-med

 bgp log-neighbor-changes

 bgp deterministic-med

 neighbor 10.254.3.2 remote-as zzzzz

 neighbor 10.254.3.2 update-source Loopback0

 neighbor x.x.x.x remote-as 15802

 neighbor x.x.x.x dont-capability-negotiate

 !

 address-family ipv4

  bgp dampening

  network y.y.y.y mask 255.255.255.0

  network y.y.x.x mask 255.255.252.0

  neighbor 10.254.3.2 activate

  neighbor 10.254.3.2 next-hop-self

  neighbor x.x.x.x activate

  neighbor x.x.x.x soft-reconfiguration inbound

  neighbor x.x.x.x route-map LOCAL-PREF in

  neighbor x.x.x.x route-map PREPEND out

 exit-address-family


the other party is a bit difficult to deal with, so if i can do anything to resolve this issue on my end it would be great if i can get pointers. 

21 Replies 21

sorry I can not open link. 
can you share it again 

Hi @MHM Cisco World ,

You should be able to open it if you have a CCO account.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

when i try to access the link i get the below error in the screenshot. 

 

Screenshot 2022-11-30 at 5.21.16 PM.png

 

Hi @promise2k ,

The best way to handle the issue would be to contact TAC, mention that you might be running into CSCva92216 so they can recommend a software upgrade path.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Hello


@promise2k wrote:

 when i plugged in the new router by e-BGP was not coming up. i was getting the below error message


Your oun ASN is 15802 and its looks like you are ibgp peering twice, so you have no EBGP peering set:



OPEN Message result
Marker: 16 bytes
Length: 85 bytes : 0055
Type: OPEN Message (1) : 01
Version: 4 : 04
My AS: 15802 : 3dba
Hold time: 180 : 00b4

 

neighbor 10.254.3.2 remote-as zzzzz
neighbor 10.254.3.2 update-source Loopback0
neighbor 10.254.3.2 next-hop-self
 neighbor x.x.x.x remote-as 15802 <-------

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

can I see 

show ip bgp nei


after upgrade ?

#sh ip bgp neighbors x.x.x.x

BGP neighbor is x.x.x.x,  remote AS 15802, external link

  BGP version 4, remote router ID 10.44.17.15

  BGP state = Established, up for 1d23h

  Last read 00:00:07, last write 00:00:31, hold time is 180, keepalive interval is 60 seconds

  Neighbor sessions:

    1 active, is not multisession capable (disabled)

  Neighbor capabilities:

    Route refresh: advertised and received(new)

    Four-octets ASN Capability: advertised and received

    Address family IPv4 Unicast: advertised and received

    Graceful Restart Capability: received

      Remote Restart timer is 120 seconds

      Address families advertised by peer:

        IPv4 Unicast (was not preserved)

    Enhanced Refresh Capability: advertised

    Multisession Capability:

    Stateful switchover support enabled: NO for session 1

  Message statistics:

    InQ depth is 0

    OutQ depth is 0




                         Sent       Rcvd

    Opens:                  1          1

    Notifications:          0          0

    Updates:               11     612342

    Keepalives:          3133          2

    Route Refresh:          0          0

    Total:               3145     612345

  Do log neighbor state changes (via global configuration)

  Default minimum time between advertisement runs is 30 seconds




 For address family: IPv4 Unicast

  Session: x.x.x.x

  BGP table version 753, neighbor version 753/0

  Output queue size : 0

  Index 2, Advertise bit 1

  2 update-group member

  Inbound soft reconfiguration allowed

  Inbound path policy configured

  Outbound path policy configured

  Route map for incoming advertisements is LOCAL-PREF

  Route map for outgoing advertisements is PREPEND

  Slow-peer detection is disabled

  Slow-peer split-update-group dynamic is disabled

                                 Sent       Rcvd

  Prefix activity:               ----       ----

    Prefixes Current:               2         47 (Consumes 65111360 bytes)

    Prefixes Total:                10        518

    Implicit Withdraw:              8        227

    Explicit Withdraw:              0          4

    Used as bestpath:             n/a         47

    Used as multipath:            n/a          0

    Used as secondary:            n/a          0

    Saved (soft-reconfig):        n/a     478713 (Consumes 65104968 bytes)




                                   Outbound    Inbound

  Local Policy Denied Prefixes:    --------    -------

    route-map:                            0    3322877

    AS_PATH too long:                     0    1143333

    Other Policies:                    1384        n/a

    Total:                             1384    4466210

  Number of NLRIs in the update sent: max 1, min 0

  Current session network count peaked at 280 entries at 11:26:23 Dec 3 2022 UTC (1d23h ago)

  Highest network count observed at 280 entries at 11:26:23 Dec 3 2022 UTC (1d23h ago)

  Last detected as dynamic slow peer: never

  Dynamic slow peer recovered: never

  Refresh Epoch: 1

  Last Sent Refresh Start-of-rib: never

  Last Sent Refresh End-of-rib: never

  Last Received Refresh Start-of-rib: never

  Last Received Refresh End-of-rib: never

                                       Sent       Rcvd

        Refresh activity:              ----       ----

          Refresh Start-of-RIB          0          0

          Refresh End-of-RIB            0          0




  Address tracking is enabled, the RIB does have a route to x.x.x.x

  Route to peer address reachability Up: 1; Down: 0

    Last notification 1d23h

  Connections established 1; dropped 0

  Last reset never

  External BGP neighbor configured for connected checks (single-hop no-disable-connected-check)

  Interface associated: GigabitEthernet0/0/0 (peering address in same link)

  Transport(tcp) path-mtu-discovery is enabled

  Graceful-Restart is disabled

  SSO is disabled

Connection state is ESTAB, I/O status: 1, unread input bytes: 0

Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 1

Local host: y.y.y.y, Local port: 42369

Foreign host: x.x.x.x, Foreign port: 179

Connection tableid (VRF): 0

Maximum output segment queue size: 50




Enqueued packets for retransmit: 0, input: 0  mis-ordered: 0 (0 bytes)




Event Timers (current time is 0xA3492FA):

Timer          Starts    Wakeups            Next

Retrans          3141          1             0x0

TimeWait            0          0             0x0

AckHold         41766       5660             0x0

SendWnd             0          0             0x0

KeepAlive           0          0             0x0

GiveUp              0          0             0x0

PmtuAger       169486     169485       0xA349378

DeadWait            0          0             0x0

Linger              0          0             0x0

ProcessQ            0          0             0x0




iss: 3311521962  snduna: 3311582118  sndnxt: 3311582118

irs: 2990284550  rcvnxt: 3069037409




sndwnd:  31723  scale:      0  maxrcvwnd:  16384

rcvwnd:  15342  scale:      0  delrcvwnd:   1042




SRTT: 1000 ms, RTTO: 1003 ms, RTV: 3 ms, KRTT: 0 ms

minRTT: 3 ms, maxRTT: 1000 ms, ACK hold: 200 ms

uptime: 170940435 ms, Sent idletime: 7971 ms, Receive idletime: 8171 ms

Status Flags: active open

Option Flags: nagle, path mtu capable

IP Precedence value : 6




Datagrams (max data segment is 1460 bytes):

Rcvd: 59892 (out of order: 0), with data: 56777, total data bytes: 78752858

Sent: 74915 (retransmit: 1, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 3139, total data bytes: 60155




 Packets received in fast path: 0, fast processed: 0, slow path: 0

 fast lock acquisition failures: 0, slow path: 0

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