From: Bola Adegbonmire (BolaAD@Resourcery.com.ng)
Date: Sun Sep 15 2002 - 11:13:27 GMT-3
Truth is the routers communicate with one acting more or less as the server (not the initiator of the TCP session)and recieves the peer's communication on TCP port 179 while acknowledging to a port >=11000 on the peer. And this will be reversed on the peer. It isn't port 179-to-179 on both ends.
-----Original Message-----
From: Szeto Jeff [mailto:jytszeto@hotmail.com]
Sent: Friday, September 13, 2002 3:59 PM
To: bf5tgh1@yahoo.com
Cc: ccielab@groupstudy.com
Subject: Re: Help please, isdn flapping
Hi,
Thank you. You are right.
By adding "access 100 deny tcp any eq bgp" , the line stop flapping.
Is it saying that both router will use the tcp 179 port for communication
when building neighbour?
Jeff
>From: ying c <bf5tgh1@yahoo.com>
>To: jeff szeto <jytszeto@hotmail.com>
>Subject: Re: Help please, isdn flapping
>Date: Fri, 13 Sep 2002 07:34:53 -0700 (PDT)
>
>I'd try to add "no nei peer" on both isdn routers.
>Also add "access-list 100 deny tcp any eq bgp any",
>because the source is dialing from R3.
>
>--- jeff szeto <jytszeto@hotmail.com> wrote:
> > Hi Group,
> >
> > Help please. Isdn is flopping and I cannot solve it.
> >
> > R3 goes up and down. The debug shows that the dial
> > reason is R3 tries to reach
> > 172.16.4.4, which is not the two ends of the isdn..
> > This is the RID of R3's bgp peer. However, I have
> > deny bgp in the
> > dialer-list.
> > No routing protocol is used. I just use floating
> > static routes.
> >
> > The following is the related config, could someone
> > help me to solve it?
> >
> > Thank you in advance.
> >
> >
> > Jeff
> >
> >
> > R3
> > !
> > logging rate-limit console 10 except errors
> > !
> > username R5 password 0 cisco
> > !
> > interface Loopback0
> > ip address 172.16.3.3 255.255.255.0
> > !
> > interface BRI0
> > ip address 172.16.35.6 255.255.255.252
> > encapsulation ppp
> > dialer map ip 172.16.35.5 name R5 broadcast 1111
> > dialer map ip 172.16.35.5 name R5 broadcast 1113
> > dialer-group 1
> > isdn switch-type basic-5ess
> > isdn spid1 221112
> > isdn spid2 221114
> > ppp authentication chap
> > !
> > router bgp 1
> > bgp router-id 172.16.3.3
> > neighbor 172.16.4.4 remote-as 1
> > neighbor 172.16.4.4 update-source Loopback0
> > !
> > ip route 0.0.0.0 0.0.0.0 172.16.35.5 200
> >
> > access-list 100 deny ip any host 224.0.0.10
> > access-list 100 deny tcp any any eq bgp
> > access-list 100 deny eigrp any any
> > access-list 100 permit ip any any
> > dialer-list 1 protocol ip list 100
> >
> >
> >
> > R5
> >
> > username R3 password 0 cisco
> > !
> > interface Loopback0
> > ip address 172.16.5.5 255.255.255.0
> >
> > interface BRI0
> > ip address 172.16.35.5 255.255.255.252
> > encapsulation ppp
> > dialer map ip 172.16.35.6 name R3 broadcast 1112
> > dialer map ip 172.16.35.6 name R3 broadcast 1114
> > dialer-group 1
> > ppp authentication chap
> > !
> > router bgp 101
> > bgp router-id 172.16.5.5
> > neighbor 172.16.3.3 remote-as 1
> > neighbor 172.16.3.3 ebgp-multihop 255
> > neighbor 172.16.3.3 update-source Loopback0
> > neighbor 172.16.3.3 route-map as-comm in
> > !
> > ip route 172.16.30.0 255.255.255.0 172.16.35.6 200
> > !
> > access-list 100 deny ip any host 224.0.0.10
> > access-list 100 deny tcp any any eq bgp
> > access-list 100 deny eigrp any any
> > access-list 100 permit ip any any
> > dialer-list 1 protocol ip list 100
> >
> > R3#
> > *Mar 2 07:34:56: BR0 DDR: ip (s=172.16.3.3,
> > d=172.16.4.4), 40 bytes, outgoing
> > int
> > eresting (list 100)
> > *Mar 2 07:34:56: BR0 DDR: Dialing cause ip
> > (s=172.16.3.3, d=172.16.4.4)
> > *Mar 2 07:34:56: BR0 DDR: Attempting to dial 1111
> > *Mar 2 07:34:57: %LINK-3-UPDOWN: Interface BRI0:1,
> > changed state to up
> > R3#
> > *Mar 2 07:34:57: BR0:1 DDR: dialer protocol up
> > R3#
> > *Mar 2 07:34:58: %LINEPROTO-5-UPDOWN: Line protocol
> > on Interface BRI0:1,
> > change
> > d state to up
> > R3#
> > *Mar 2 07:35:03: %ISDN-6-CONNECT: Interface BRI0:1
> > is now connected to 1111
> > R5
> > R3#
> > *Mar 2 07:35:06: BR0 DDR: ip (s=172.16.3.3,
> > d=172.16.4.4), 40 bytes, outgoing
> > int
> > eresting (list 100)
> > R3#
> > *Mar 2 07:35:16: BR0 DDR: ip (s=172.16.3.3,
> > d=172.16.4.4), 40 bytes, outgoing
> > int
> > eresting (list 100)
> > R3#
> > *Mar 2 07:36:57: %ISDN-6-DISCONNECT: Interface
> > BRI0:1 disconnected from 111
> > 1 R5, call lasted 119 seconds
> > *Mar 2 07:36:57: %LINK-3-UPDOWN: Interface BRI0:1,
> > changed state to down
> > R3#
> > *Mar 2 07:36:57: BR0:1 DDR: disconnecting call
> > R3#
> > *Mar 2 07:36:58: %LINEPROTO-5-UPDOWN: Line protocol
> > on Interface BRI0:1,
> > change
> > d state to down
> > R3#
> > *Mar 2 07:37:13: BR0 DDR: ip (s=172.16.3.3,
> > d=172.16.4.4), 44 bytes, outgoing
> > int
> > eresting (list 100)
> > *Mar 2 07:37:13: BR0 DDR: Dialing cause ip
> > (s=172.16.3.3, d=172.16.4.4)
> > *Mar 2 07:37:13: BR0 DDR: Attempting to dial 1111
> > R3#
> > *Mar 2 07:37:13: %LINK-3-UPDOWN: Interface BRI0:1,
> > changed state to up
> > R3#
> > *Mar 2 07:37:15: BR0 DDR: ip (s=172.16.3.3,
> > d=172.16.4.4), 40 bytes, outgoing
> > int
> > eresting (list 100)
> > *Mar 2 07:37:15: BR0 DDR: ip (s=172.16.3.3,
> > d=172.16.4.4), 44 bytes, outgoing
> > int
> > eresting (list 100)
> > *Mar 2 07:37:15: BR0:1 DDR: dialer protocol up
> > R3#
> > *Mar 2 07:37:16: %LINEPROTO-5-UPDOWN: Line protocol
> > on Interface BRI0:1,
> > change
> > d state to up
> > R3#
> >
> > R3#sh dialer
> >
> > BRI0 - dialer type = ISDN
> >
> > Dial String Successes Failures Last DNIS
> > Last status
> > 1113 0 0 never
> > -
> > 1111 4 0 00:00:39
> > successful
> > 0 incoming call(s) have been screened.
> > 0 incoming call(s) rejected for callback.
> >
> > BRI0:1 - dialer type = ISDN
> > Idle timer (120 secs), Fast idle timer (20 secs)
> > Wait for carrier (30 secs), Re-enable (15 secs)
> > Dialer state is data link layer up
> > Dial reason: ip (s=172.16.3.3, d=172.16.4.4)
> > Time until disconnect 94 secs
> > Connected to 1111 (R5)
> >
> > BRI0:2 - dialer type = ISDN
> > Idle timer (120 secs), Fast idle timer (20 secs)
> > Wait for carrier (30 secs), Re-enable (15 secs)
> > Dialer state is idle
> > R3#
> > R3#
> > R3#
>
>
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