From: Gregg Malcolm (greggm@xxxxxxxxxxxxx)
Date: Wed Mar 20 2002 - 17:59:10 GMT-3
Huy,
What you are saying at the end of this message is true *if* your loopback
had an address of 1.1.1.0 255.0.0.0. If you leave the mask out of the
network statement, the BGP process must assume a mask (and of course it
picks a classful mask). I haven't really played with not using a mask as I
always make it a practice to use masks on network statements in BGP. I
can't imagine a good reason not to use a mask when it's always an option.
Try changing the mask on the loop and I think you'll see the route in BGP.
Maybe I'm mis-understanding the question or a missing a fundamental property
of routing in general.
Gregg
----- Original Message -----
From: "Huy Luu" <hluu@veroxity.com>
To: "Tshon" <tshon@netzero.net>
Cc: <ccielab@groupstudy.com>; "Lab Candidate" <labccie@yahoo.com>;
<nobody@groupstudy.com>
Sent: Wednesday, March 20, 2002 12:05 PM
Subject: Re: BGP routes don't show up in BGP table
> I got it to work, by adding the additional mask command.
> But I'm still confuse. First I used the network 1.1.1.0, which did not
> work. I also added no sync and no auto-summary, which did not work. I
> thought that if I use the network command to advertise a network, and if I
> have a valid route to a subnet of that network, it should advertise the
> network and auto summarize at the classful boundary. In this example the
> router should summarize and advertise 1.0.0.0/8 if I use the network
> statement 1.1.1.0, but it did not.
>
>
>
>
> Tshon
> <tshon@netzero To: Lab Candidate
<labccie@yahoo.com>
> .net> cc: ccielab@groupstudy.com
> Sent by: Subject: Re: BGP routes don't
show up in BGP table
> nobody@groupst
> udy.com
>
>
> 03/20/02 02:31
> PM
> Please respond
> to Tshon
>
>
>
>
>
>
> You will only advertis networks you can reach. You don't have a network
> 1.1.1.1 in your routing table.
> You don't have a network 2.2.2.2 in your routing table. Try Network
> 1.1.1.0 and 2.2.2.0.
>
> Tshon
>
> Lab Candidate wrote:
>
> >Here is a basic BGP setup with r1 and r2:
> > r1 AS100 r2 AS200
> > s0----------------s0
> > lo0 1.1.1.1 lo0 2.2.2.2
> >I am advertising both r1's and r2's loopbacks lo0 by putting under a
> network statement.
> >but somehow they never showed up in the other's BGP table. What am I
doing
> wrong?
> >here is the configs and output from both r1 and r2:
> >
> >r1#
> >1d00h: BGP: 192.168.1.2 went from Idle to Active
> >1d00h: BGP: 192.168.1.2 open active, delay 15324ms
> >1d00h: BGP: 192.168.1.2 open active, local address 192.168.1.1
> >1d00h: BGP: scanning routing tables
> >1d00h: BGP: nettable_scan: invalidate local path for 1.0.0.0/8
> >1d00h: BGP: nettable_scan: invalidate sourced path for 1.0.0.0/8
> >1d00h: BGP: no valid path for 1.0.0.0/8
> >1d00h: BGP: nettable_walker 1.0.0.0/8 no best path
> >
> >r1#sh ip ro
> >Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> > D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> > N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> > E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> > i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
> default
> > U - per-user static route, o - ODR
> >
> >Gateway of last resort is not set
> >
> > 1.0.0.0/24 is subnetted, 1 subnets
> >C 1.1.1.0 is directly connected, Loopback0
> >C 192.168.1.0/24 is directly connected, Serial0
> >
> >r1#sh ip bgp
> > {blank}
> >r1#
> >
> >r1#sh run
> >Building configuration...
> >
> >Current configuration:
> >!
> >version 12.0
> >service timestamps debug uptime
> >service timestamps log uptime
> >no service password-encryption
> >!
> >hostname r1
> >!
> >!
> >ip subnet-zero
> >!
> >!
> >!
> >interface Loopback0
> > ip address 1.1.1.1 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Ethernet0
> > no ip address
> > no ip directed-broadcast
> > shutdown
> >!
> >interface Serial0
> > ip address 192.168.1.1 255.255.255.0
> > no ip directed-broadcast
> > clockrate 64000
> >!
> >interface Serial1
> > no ip address
> > no ip directed-broadcast
> > shutdown
> >!
> >router bgp 100
> > network 1.1.1.1
> > neighbor 192.168.1.2 remote-as 200
> >!
> >ip classless
> >!
> >!
> >line con 0
> > exec-timeout 0 0
> > logging synchronous
> > transport input none
> >line aux 0
> >line vty 0 4
> >!
> >end
> >
> >r1#
> >r1#sh ip bgp nei
> >BGP neighbor is 192.168.1.2, remote AS 200, external link
> > Index 1, Offset 0, Mask 0x2
> > BGP version 4, remote router ID 2.2.2.2
> > BGP state = Established, table version = 25, up for 00:03:02
> > Last read 00:00:03, hold time is 180, keepalive interval is 60 seconds
> > Minimum time between advertisement runs is 30 seconds
> > Received 6 messages, 0 notifications, 0 in queue
> > Sent 6 messages, 0 notifications, 0 in queue
> > Prefix advertised 0, suppressed 0, withdrawn 0
> > Connections established 1; dropped 0
> > Last reset never
> > 0 accepted prefixes consume 0 bytes
> > 0 history paths consume 0 bytes
> >Connection state is ESTAB, I/O status: 1, unread input bytes: 0
> >Local host: 192.168.1.1, Local port: 11000
> >Foreign host: 192.168.1.2, Foreign port: 179
> >
> >Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
> >
> >Event Timers (current time is 0x545E3C0):
> >Timer Starts Wakeups Next
> >Retrans 19 12 0x0
> >TimeWait 0 0 0x0
> >AckHold 6 2 0x0
> >SendWnd 0 0 0x0
> >KeepAlive 0 0 0x0
> >GiveUp 0 0 0x0
> >PmtuAger 0 0 0x0
> >DeadWait 0 0 0x0
> >
> >iss: 278568032 snduna: 278568157 sndnxt: 278568157 sndwnd:
16260
> >irs: 2897909981 rcvnxt: 2897910106 rcvwnd: 16260 delrcvwnd:
124
> >
> >SRTT: 614 ms, RTTO: 4262 ms, RTV: 1517 ms, KRTT: 0 ms
> >minRTT: 24 ms, maxRTT: 300 ms, ACK hold: 200 ms
> >Flags: higher precedence, nagle
> >
> >Datagrams (max data segment is 1460 bytes):
> >Rcvd: 11 (out of order: 0), with data: 6, total data bytes: 124
> >Sent: 10 (retransmit: 12), with data: 6, total data bytes: 124
> >r1#
> >
> >=================== r2 config and debug =================
> >r2#sh run
> >Building configuration...
> >
> >Current configuration:
> >!
> >version 12.0
> >service timestamps debug uptime
> >service timestamps log uptime
> >no service password-encryption
> >!
> >hostname r2
> >!
> >!
> >ip subnet-zero
> >!
> >!
> >!
> >interface Loopback0
> > ip address 2.2.2.2 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Ethernet0
> > no ip address
> > no ip directed-broadcast
> > shutdown
> >!
> >interface Serial0
> > ip address 192.168.1.2 255.255.255.0
> > no ip directed-broadcast
> >!
> >interface Serial1
> > no ip address
> > no ip directed-broadcast
> > shutdown
> >!
> >router bgp 200
> > network 2.2.2.2
> > neighbor 192.168.1.1 remote-as 100
> >!
> >ip classless
> >!
> >!
> >line con 0
> > transport input none
> >line aux 0
> >line vty 0 4
> >!
> >end
> >
> >r2#
> >r2#sh ip int b
> >Interface IP-Address OK? Method Status
> Protocol
> >
> >Ethernet0 unassigned YES unset administratively down
> down
> >
> >Loopback0 2.2.2.2 YES manual up
up
> >
> >Serial0 192.168.1.2 YES manual up
up
> >
> >Serial1 unassigned YES unset administratively down
> down
> >
> >r2#sh ip ro
> >Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> > D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> > N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> > E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> > i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
> default
> > U - per-user static route, o - ODR
> >
> >Gateway of last resort is not set
> >
> > 2.0.0.0/24 is subnetted, 1 subnets
> >C 2.2.2.0 is directly connected, Loopback0
> >C 192.168.1.0/24 is directly connected, Serial0
> >
> >r2#sh ip bgp
> > {blank}
> >r2#
> >
> >r2#sh ip bgp nei
> >r2#sh ip bgp neighbors
> >BGP neighbor is 192.168.1.1, remote AS 100, external link
> > Index 1, Offset 0, Mask 0x2
> > BGP version 4, remote router ID 1.1.1.1
> > BGP state = Established, table version = 23, up for 00:00:17
> > Last read 00:00:16, hold time is 180, keepalive interval is 60 seconds
> > Minimum time between advertisement runs is 30 seconds
> > Received 3 messages, 0 notifications, 0 in queue
> > Sent 3 messages, 0 notifications, 0 in queue
> > Prefix advertised 0, suppressed 0, withdrawn 0
> > Connections established 1; dropped 0
> > Last reset never
> > 0 accepted prefixes consume 0 bytes
> > 0 history paths consume 0 bytes
> >Connection state is ESTAB, I/O status: 1, unread input bytes: 0
> >Local host: 192.168.1.2, Local port: 179
> >Foreign host: 192.168.1.1, Foreign port: 11000
> >
> >Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
> >
> >Event Timers (current time is 0xF02CC):
> >Timer Starts Wakeups Next
> >Retrans 4 0 0x0
> >TimeWait 0 0 0x0
> >AckHold 3 2 0x0
> >SendWnd 0 0 0x0
> >
> >KeepAlive 0 0 0x0
> >GiveUp 0 0 0x0
> >PmtuAger 0 0 0x0
> >DeadWait 0 0 0x0
> >
> >iss: 2897909981 snduna: 2897910049 sndnxt: 2897910049 sndwnd:
16317
> >irs: 278568032 rcvnxt: 278568100 rcvwnd: 16317 delrcvwnd:
67
> >
> >SRTT: 710 ms, RTTO: 4442 ms, RTV: 1511 ms, KRTT: 0 ms
> >minRTT: 16 ms, maxRTT: 300 ms, ACK hold: 200 ms
> >Flags: passive open, nagle, gen tcbs
> >
> >Datagrams (max data segment is 1460 bytes):
> >Rcvd: 6 (out of order: 0), with data: 3, total data bytes: 67
> >Sent: 6 (retransmit: 0), with data: 3, total data bytes: 67
> >r2#sh ip bgp neighbors ?
> > A.B.C.D Neighbor to display information about
> > <cr>
> >
> >
> >
> >
> >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:57:14 GMT-3