Frame-relay DLCI priority levels

From: Radoslav Vasilev (deckland@gmail.com)
Date: Sat Sep 30 2006 - 09:01:27 ART

Hi Group,

I'm trying to separate two classes of traffic over two separate PVC
over a single link (back to back between two routers). The idea is to
later use PIPQ and test connectivity while checking the queueing with
PIPQ.

R4 and R5 connected back-to-back over interfaces serial 0/1 on each:

R4:

frame-relay switching

interface Serial0/1
 ip address 192.168.100.4 255.255.255.0
 encapsulation frame-relay
 clock rate 128000
 frame-relay priority-dlci-group 1 100 101 101 101
 frame-relay intf-type dce
end

access-list 100 permit icmp any any
access-list 101 permit tcp any any eq telnet
access-list 101 permit tcp any eq telnet any
priority-list 1 protocol ip high list 101
priority-list 1 protocol ip low list 100

R5:

frame-relay switching

interface Serial0/1
 ip address 192.168.100.5 255.255.255.0
 encapsulation frame-relay
 load-interval 30
 frame-relay priority-dlci-group 1 100 101 101 101
end

access-list 100 permit icmp any any
access-list 101 permit tcp any any eq telnet
access-list 101 permit tcp any eq telnet any
priority-list 1 protocol ip high list 101
priority-list 1 protocol ip low list 100

As seen above, i want to use DLCI 100 for telnet traffic (two-way) and
DLCI 101 for icmp traffic.

I'm testing with pinging/telneting to R4 from R5,here's the debug on R4:

while telneting from R5:
Rack1R4# 1 00:59:45.659: Serial0/1(i): dlci 101(0x1851), pkt type
0x800, datagramsize 45
*Mar 1 00:59:45.763: Serial0/1(o): dlci 101(0x1851), pkt type
0x800(IP), datagramsize 44
*Mar 1 00:59:45.767: Serial0/1(i): dlci 101(0x1851), pkt type 0x800,
datagramsize 45
*Mar 1 00:59:45.975: Serial0/1(o): dlci 101(0x1851), pkt type
0x800(IP), datagramsize 44
*Mar 1 00:59:45.983: Serial0/1(i): dlci 101(0x1851), pkt type 0x800,
datagramsize 46
*Mar 1 00:59:45.983: Serial0/1(o): dlci 101(0x1851), pkt type
0x800(IP), datagramsize 54

whilte pinging from R5:
*Mar 1 01:00:18.099: Serial0/1(o): dlci 101(0x1851), pkt type
0x800(IP), datagramsize 104
*Mar 1 01:00:18.115: Serial0/1(i): dlci 101(0x1851), pkt type 0x800,
datagramsize 104
*Mar 1 01:00:18.115: Serial0/1(o): dlci 101(0x1851), pkt type
0x800(IP), datagramsize 104
*Mar 1 01:00:18.131: Serial0/1(i): dlci 101(0x1851), pkt type 0x800,
datagramsize 104
*Mar 1 01:00:18.131: Serial0/1(o): dlci 101(0x1851), pkt type
0x800(IP), datagramsize 104
*Mar 1 01:00:18.151: Serial0/1(i): dlci 101(0x1851), pkt type 0x800,
datagramsize 104

So it looks like the normal priority queue is selected...

Rack1R5#sh frame-relay map
Serial0/1 (up): ip 192.168.100.4 dlci 100(0x64,0x1840), dynamic,
              broadcast,, status defined, active
  Priority DLCI Group 1, DLCI 100 (HIGH), DLCI 101 (MEDIUM)
  DLCI 101 (NORMAL), DLCI 101 (LOW)

Any ideas?
Thaks
Rado

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