04-25-2012 06:37 AM - edited 03-04-2019 04:09 PM
Hi,
#sh ip protocols | begin bgp
Routing Protocol is "bgp 65005"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
IGP synchronization is disabled
Automatic route summarization is disabled
Neighbor(s):
Address FiltIn FiltOut DistIn DistOut Weight RouteMap
15.15.12.5 LOCAL_PREF
15.15.13.5 LOCAL_PREF
10.24.35.12
Maximum path: 1
Routing Information Sources:
Gateway Distance Last Update
15.15.12.5 20 3d07h
15.15.13.5 200 3d08h <<<<<<<<<<<<<why is the admin distance 200? This is my ebgp peer?
10.24.35.12 200 3d07h
Distance: external 20 internal 200 local 200
#sh ip bgp summary | begin Neighbor
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
15.15.12.5 4 152 1835547 1963240 5854 0 0 45w3d 39
15.15.13.5 4 152 28627 30410 5854 0 0 4d22h 39 <<<<<<<<<<<<<<<<<<<<<<ebgp
10.24.35.12 4 65005 662657 662384 5854 0 0 1y7w 48
router bgp 65005
neighbor 15.15.13.5 remote-as 152 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<ebgp
So why am I getting eBGP distance 200 for 15.15.13.5 when I use #sh ip protocols | begin bgp????
Solved! Go to Solution.
04-25-2012 07:04 AM
Can you post these policy maps?
LOCAL_PREF
And can you post (masking public addresses) the bgp config?
04-25-2012 06:43 AM
Can you post "sh ip bgp neigh 15.15.13.5"?
04-25-2012 06:50 AM
here you go
#sh ip bgp neighbors 15.15.13.5
BGP neighbor is 15.15.13.5, remote AS 152, external link
Description: Telus MPLS Secondary Peer
BGP version 4, remote router ID 24.25.24.181
BGP state = Established, up for 4d22h
Last read 00:00:00, last write 00:00:10, hold time is 45, keepalive interval is 15 seconds
Configured hold time is 45, keepalive interval is 15 seconds
Minimum holdtime from neighbor is 0 seconds
Neighbor sessions:
1 active, is not multisession capable
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised
Address family IPv4 Unicast: advertised and received
Multisession Capability: advertised
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 49 248
Keepalives: 30417 28438
Route Refresh: 7 0
Total: 30474 28687
Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
Session: 15.15.13.5
BGP table version 5854, neighbor version 5854/0
Output queue size : 0
Index 6
6 update-group member
Inbound path policy configured
Incoming update prefix filter list is ACCEPTED_NETS
Outgoing update prefix filter list is ADVERTIZED_NETS
Route map for incoming advertisements is LOCAL_PREF
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 4 39 (Consumes 2028 bytes)
Prefixes Total: 27 322
Implicit Withdraw: 22 276
Explicit Withdraw: 0 7
Used as bestpath: n/a 0
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
prefix-list 273 178
Bestpath from this peer: 3 n/a
Invalid Path: 8 n/a
Total: 284 178
Number of NLRIs in the update sent: max 10, min 0
Address tracking is enabled, the RIB does have a route to 15.15.13.5
Connections established 2; dropped 1
Last reset 4d22h, due to BGP Notification received of session 1, hold time expired
Transport(tcp) path-mtu-discovery is enabled
Graceful-Restart 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: 15.15.13.6, Local port: 61462
Foreign host: 15.15.13.5, 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 0x8607CA760):
Timer Starts Wakeups Next
Retrans 30478 43 0x0
TimeWait 0 0 0x0
AckHold 28514 27740 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 1 1 0x0
DeadWait 0 0 0x0
Linger 0 0 0x0
ProcessQ 0 0 0x0
iss: 2947749338 snduna: 2948329445 sndnxt: 2948329445 sndwnd: 15339
irs: 56652898 rcvnxt: 57208441 rcvwnd: 15814 delrcvwnd: 570
SRTT: 300 ms, RTTO: 303 ms, RTV: 3 ms, KRTT: 0 ms
minRTT: 0 ms, maxRTT: 340 ms, ACK hold: 200 ms
Status Flags: active open
Option Flags: nagle, path mtu capable, md5
IP Precedence value : 6
Datagrams (max data segment is 1440 bytes):
Rcvd: 58571 (out of order: 0), with data: 28520, total data bytes: 555542
Sent: 58561 (retransmit: 43, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 30436, total data bytes: 580106
Packets received in fast path: 0, fast processed: 0, slow path: 0
fast lock acquisition failures: 0, slow path: 0
04-25-2012 07:04 AM
Can you post these policy maps?
LOCAL_PREF
And can you post (masking public addresses) the bgp config?
04-25-2012 07:16 AM
router bgp 65005
no synchronization
bgp log-neighbor-changes
neighbor 15.15.12.xxx5 remote-as 152
neighbor 15.15.12.xxx5 timers 15 45
neighbor 15.15.12.xxx5 prefix-list ACCEPTED_NETS in
neighbor 15.15.12.xxx5 route-map LOCAL_PREF in
neighbor 15.15.13.xxx5 remote-as 152
neighbor 15.15.13.xxx5 timers 15 45
neighbor 15.15.13.xxx5 prefix-list ACCEPTED_NETS in
neighbor 15.15.13.xxx5 route-map LOCAL_PREF in
neighbor 10.24.35.12 remote-as 65005
neighbor 10.24.35.12 next-hop-self
no auto-summary
#sh route-map
route-map LOCAL_PREF, permit, sequence 10
Match clauses:
Set clauses:
local-preference 80
Policy routing matches: 0 packets, 0 bytes
route-map LOCAL_PREF, permit, sequence 20
Match clauses:
Set clauses:
Policy routing matches: 0 packets, 0 bytes
The public ip's and AS# are all false.
04-25-2012 07:21 AM
I don't see anything that jumps out as the reason that you're getting that. It's treating this neighbor as iBGP it seems (AD-wise anyway). Can you post "sh ip bgp
So if the route 192.168.1.0 goes through this neighbor, post "sh ip bgp 192.168.1.0" and "sh ip bgp regex ^152"
04-25-2012 07:30 AM
Can "administrative distance" get injected by the Service provider?
04-25-2012 07:34 AM
No that's locally generated. They can change the metric that you receive though.
04-25-2012 07:39 AM
Could it be that the ISP is using "BGP backdoor"?
If I dont have anything in my configuration then it looks like the ISP is doing something?
Please advise.
04-25-2012 07:45 AM
A backdoor allows a route from another routing protocol with a higher distance to be used instead of the lower AD from eBGP. In other words, it allows say EIGRP learned route of 192.168.1.0/24 and eBGP learned route of 192.168.1.0/24 to use the EIGRP learned route instead of the eBGP learned one.
Can you post "sh ip bgp
So if the route 192.168.1.0 goes through this neighbor, post "sh ip bgp 192.168.1.0" and "sh ip bgp regex ^152"
04-25-2012 07:46 AM
Hi,
I got it ....It is actually the ISP set it on their side and I am seeing it.
It is not what I set ...I still treat it as 20.
Thanks for looking into it
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