From: Mike Dickson (Mike@dicksonnetworks.com)
Date: Thu Feb 10 2005 - 00:27:04 GMT-3
All,
I was playing around with default dial-peers today, and I've ended the
day more confused about the ip precedence set by the default dial-peer
than when I began my experimentation. Hopefully, someone here can shed
some light on this issue.
If an incoming VoIP call does not match a configured dial-peer, the
voice gateway will match the incoming leg against the default dial-peer
(dial-peer 0). According to CCO documentation, the ip precedence
setting for the default dial-peer is 0. However, I've found that if I
complete a call to an FXS port on a router without a matching configured
dial-peer, the return traffic is marked EF, not precedence 0. I even
set the DSCP marking on the calling router to cs4 to make sure that I
wasn't just mirroring the incoming marking, but the return traffic was
still being marked EF. Here are the configs. I'm running 12.2(15)T9 on
both routers.
Called router
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
logging queue-limit 100
enable secret 5 $1$IfjN$PfA4KYGMpQjw.F5cBWOHD.
!
memory-size iomem 10
ip subnet-zero
!
!
no ip domain lookup
!
ip cef
ip cef accounting per-prefix
mpls ldp logging neighbor-changes
!
!
!
!
!
!
!
!
!
no voice hpi capture buffer
no voice hpi capture destination
!
!
mta receive maximum-recipients 0
!
!
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface Ethernet0/0
ip address 192.168.24.2 255.255.255.0
ip accounting output-packets
ip accounting precedence input
ip accounting precedence output
half-duplex
!
interface Serial0/0
no ip address
shutdown
!
interface Ethernet0/1
no ip address
shutdown
half-duplex
!
interface Serial0/1
no ip address
shutdown
!
interface Serial0/2
no ip address
shutdown
!
interface Serial0/3
no ip address
shutdown
!
router eigrp 24
network 2.0.0.0
network 192.168.24.0
no auto-summary
!
ip http server
ip classless
!
!
!
!
!
call rsvp-sync
!
voice-port 1/0/0
!
voice-port 1/0/1
!
!
mgcp profile default
!
dial-peer cor custom
!
!
!
dial-peer voice 2222 pots
destination-pattern 2222
port 1/0/0
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
exec-timeout 0 0
password cisco
logging synchronous
login
!
!
Calling router
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R5
!
logging queue-limit 100
enable secret 5 $1$EK7e$SnfgmfaPJw5BYyhVGug0U0
!
memory-size iomem 10
ip subnet-zero
!
!
no ip domain lookup
!
ip cef
ip cef accounting per-prefix
mpls ldp logging neighbor-changes
!
!
!
!
!
!
!
!
!
no voice hpi capture buffer
no voice hpi capture destination
!
!
mta receive maximum-recipients 0
!
!
!
!
interface Loopback0
ip address 5.5.5.5 255.255.255.255
!
interface Ethernet0/0
ip address 192.168.24.5 255.255.255.0
ip accounting output-packets
ip accounting precedence input
ip accounting precedence output
half-duplex
!
interface Serial0/0
no ip address
shutdown
no fair-queue
!
interface BRI0/0
no ip address
shutdown
!
interface Ethernet0/1
no ip address
shutdown
half-duplex
!
interface Serial0/1
no ip address
shutdown
!
router eigrp 24
network 5.0.0.0
network 192.168.24.0
no auto-summary
!
ip http server
ip classless
!
!
!
!
!
call rsvp-sync
!
voice-port 1/0/0
!
voice-port 1/0/1
!
!
mgcp profile default
!
dial-peer cor custom
!
!
!
dial-peer voice 5555 pots
destination-pattern 5555
port 1/0/0
!
dial-peer voice 2222 voip
destination-pattern 22..
session target ipv4:192.168.24.2
ip qos dscp cs4 media
no vad
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
exec-timeout 0 0
password cisco
logging synchronous
login
!
!
When I called 2222 from the Calling router, I was able to verify using
show call active voice brief that the incoming dial-peer on the called
router was dial-peer 0. Is the CCO documentation incorrect and the
default marking on dial-peer 0 EF, or is something else marking the
return traffic?
Thanks in advance for any help you can give me.
Mike Dickson
CCIE #12281 (Routing & Switching, Security
This archive was generated by hypermail 2.1.4 : Thu Mar 03 2005 - 08:51:18 GMT-3