Getting a Interface up, line protocol down. Link used to work fine. Line has been tested by ISP. Appears PPP negotiation is failing:
Router 1: Se0 LCP: TIMEout: State ACKsent
Router 2: Se0 LCP: TIMEout: State REQsent
Any ideas? Both have the same encapsulation and are using ESF/B8ZF. Power cycling does nothing.
I would look at the possibility of a problem on the line which interrupts transmission in one direction. It looks to me like Router2 has transmitted to negotiate the link (REQsent) and like Router1 has sent an acknowledgement but Router2 does not receive what Router1 is sending.
In terms of ways to test you might think about these alternatives:
- perhaps the packet counters in show interface might be helpful. You could try this: clear interface counters on both interfaces, wait a while while the link is attempting to negotiate, do show interface and look at packets out and packets in on both interfaces. Is there much mismatch between sent from Router2 to received on Router1 (and in the other direction also)?
- perhaps debug ppp negotiation (on both routers) might show one router sending and receiving while the other router is sending but not receiving?
- you might try debug serial interface and see if it gives you anything helpful.
- you might try configuring both router interfaces for HDLC encapsulation instead of PPP. The debug showing the HDLC yourseen and myseen might show whether there is one way traffic in one direction.
Have you checked the line(See Below T-Shooting cmds .Also are you running a clock rate at the DTE end of the line, did you set the clockrate to internal
clockrate internal, or did you specify the clock rate instead using above config with clockrate 64000(@the DTE end of the cable)
also the clock rate command is used @ the DTE end of the cable Use the following t-Shoting cmds
SH CONTROLLERS <"INT">
SH IP INT BR
SH IP INT S0 "Or whatever interface used to connect to the other router.
Take care HTH.
Clock source is specified by the line. The WICs include integrated CSU/DSU modules too FYI. Output (note # substituted for IPs):
Corp#sh ip int s0
Serial0 is up, line protocol is down
Interface is unnumbered. Using address of FastEthernet0 (#)
Broadcast address is 255.255.255.255
MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
Outgoing access list is not set
Inbound access list is not set
Proxy ARP is enabled
Security level is default
Split horizon is enabled
ICMP redirects are always sent
ICMP unreachables are always sent
ICMP mask replies are never sent
IP fast switching is enabled
IP fast switching on the same interface is enabled
IP Fast switching turbo vector
IP multicast fast switching is disabled
IP multicast distributed fast switching is disabled
IP route-cache flags are Fast
Router Discovery is disabled
IP output packet accounting is disabled
IP access violation accounting is disabled
TCP/IP header compression is disabled
RTP/IP header compression is disabled
Probe proxy name replies are disabled
Policy routing is disabled
Network address translation is disabled
WCCP Redirect outbound is disabled
WCCP Redirect exclude is disabled
BGP Policy Mapping is disabled
Corp#sh ip int br
Interface IP-Address OK? Method Status Prot
FastEthernet0 # YES NVRAM up up
Serial0 # YES unset up down
Serial1 # YES unset up up
Corp#sh controllers serial 0
Hardware is PowerQUICC MPC860 with Integrated FT1 CSU/DSU module
TX and RX clocks detected.
idb at 0x80920A28, driver data structure at 0x80926DB8
General [GSMR]=0x2:0x00000030, Protocol-specific [PSMR]=0x8
Events [SCCE]=0x0300, Mask [SCCM]=0x001F, Status [SCCS]=0x02
Transmit on Demand [TODR]=0x0, Data Sync [DSR]=0x7E7E
Config [CICR]=0x00365F80, Pending [CIPR]=0x00008800
Mask [CIMR]=0x60204400, In-srv [CISR]=0x00000000
SCC GENERAL PARAMETER RAM (at 0xFF003C00)
Rx BD Base [RBASE]=0x2230, Fn Code [RFCR]=0x18
Tx BD Base [TBASE]=0x22B0, Fn Code [TFCR]=0x18
Max Rx Buff Len [MRBLR]=1548
Rx State [RSTATE]=0x0, BD Ptr [RBPTR]=0x2230
Tx State [TSTATE]=0x0, BD Ptr [TBPTR]=0x22B0
SCC HDLC PARAMETER RAM (at 0xFF003C38)
CRC Preset [C_PRES]=0xFFFF, Mask [C_MASK]=0xF0B8
Errors: CRC [CRCEC]=0, Aborts [ABTSC]=0, Discards [DISFC]=0
Nonmatch Addr Cntr [NMARC]=0
Retry Count [RETRC]=0
Max Frame Length [MFLR]=1608
Rx Int Threshold [RFTHR]=0, Frame Cnt [RFCNT]=10193
User-defined Address 0000/0000/0000/0000
User-defined Address Mask 0x0000
buffer size 1524
PowerQUICC SCC specific errors:
4596 input aborts on receiving flag sequence
0 throttles, 0 enables
0 transmitter underruns
0 transmitter CTS losts
If you rebooted both routers then there's a good chance Router1's WIC CSU/DSU might be faulty as the ACK packets sent by Router1 isn't making it to Router2. Can you try swapping the WIC on Router1?
could you try shutting down both interfaces, also double check the encapsulatiom , compression type or Authentication if any..
if the problem exist , please issue the (debug ppp negotiation) privilege command & post the output.