From: Jack Heney (jheneyccie@xxxxxxxxxxx)
Date: Mon Oct 09 2000 - 19:32:05 GMT-3
The following is from Cisco's web site:
source-bridge ring-group 100
dlsw local-peer peer-id 4.0.0.4
dlsw remote-peer 0 tcp 5.0.0.5 priorityinterface TokenRing0
ring-speed 16
sap-priority 1
source-bridge 1 1 100
source-bridge spanning
ip policy route-map test
sap-priority-list 1 high ssap 4 dsap 8
interface Serial 0
ip address 20.0.0.1 255.0.0.0
interface Serial 1
ip address 30.0.0.1 255.0.0.0
ip local policy route-map test
access-list 101 permit tcp any any eq 2065
access-list 102 permit tcp any any eq 1981
access-list 102 permit tcp any eq 20 any
route-map test permit 3
set default int serial 0
route-map test permit 2
match ip address 102
set ip next-hop 30.0.0.7
route-map test permit 1
match ip address 101
set ip next-hop 20.0.0.6
The text that goes qith this example indicates that the point is to send
interactive SNA traffic (hiogh priority) over one link and file transfers
(SNA or FTP - low priority) over another. I have 2 questions:
1. Can someone give a brief explanation of when SNA uses certain sap's...I
though SNA could be filtered across the board using an access list with
0x0404 0x0101, which would seem to indicate that 04 and 05 are the sap's
used by SNA...According to the above example, 0804 (dsap ssap) is
interactive SNA and 0808 is SNA file transfers.
2. Wouldn't the line:
sap-priority-list 1 low ssap 8 dsap 8
put traffic into the low-priority DLSW pipe, which I thought used tcp port
1983? In the above example, they use this line, but then traffic is policy
routed using access-list 102, which specifies port 1981. Is this just a
typo in Cisco's config, or is 1981 low priority and 1983 normal priority?
Thanks in advance,
Jack
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