Cisco IOS Cookbook, 2nd Edition

Viewing SDLC Status Information

Problem

You want to check the status of an SDLC device on your router.

Solution

You can get a lot of useful SDLC information simply by looking at the interface:

Router>show int serial1 Serial1 is up, line protocol is up Hardware is HD64570 Description: Connection to three remote SDLC devices MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation SDLC, loopback not set Router link station role: PRIMARY (DCE) Router link station metrics: slow-poll 30 seconds T1 (reply time out) 3000 milliseconds N1 (max frame size) 12016 bits N2 (retry count) 20 poll-pause-timer 200 milliseconds poll-limit-value 1 k (windowsize) 7 modulo 8 sdlc vmac: 4000.CCCC.00-- sdlc addr 20 state is CONNECT cls_state is CLS_IN_SESSION VS 0, VR 0, Remote VR 0, Current retransmit count 0 Hold queue: 0/200 IFRAMEs 5025/618 TESTs 0/0 XIDs 0/0, DMs 0/0 FRMRs 0/0 RNRs 15/2 SNRMs 0/0 DISC/RDs 0/0 REJs 0/0 Poll: clear, Poll count: 0, ready for poll, chain: 22/21 sdlc addr 21 state is CONNECT cls_state is CLS_IN_SESSION VS 0, VR 0, Remote VR 0, Current retransmit count 0 Hold queue: 0/200 IFRAMEs 127/15 TESTs 0/0 XIDs 0/0, DMs 0/0 FRMRs 0/0 RNRs 1/0 SNRMs 0/0 DISC/RDs 0/0 REJs 0/0 Poll: clear, Poll count: 0, ready for poll, chain: 20/22 sdlc addr 22 state is SNRMSENT cls_state is CLS_CONNECT_RSP_PEND VS 0, VR 0, Remote VR 0, Current retransmit count 0 Hold queue: 0/200 IFRAMEs 25/0 TESTs 0/0 XIDs 0/0, DMs 0/0 FRMRs 0/0 RNRs 0/0 SNRMs 0/0 DISC/RDs ...