EdgeRouter – EdgeMAX. Acceso por consola al router

EdgeMAX
EdgeMAX

 

motivación

En ocasiones y por diversos motivos es posible que se pierda acceso vía http o ssh a un router EdgeMAX. En estos casos existe una tercera vía de conexión gracias al acceso por consola.

conectandose al router

Puesto que el router está inaccesible no podemos acceder a éste normalmente a través de la página web o a través de ssh. En cambio sí que existe la posibilidad de conectarse al equipo a través del puerto serie. Aunque se trata de un zócalo para RJ-45 no hay que confundirlo con una conexión de red y será necesario un cable, que por un lado tiene un RJ-45 y por el otro un DB9. Existen diferentes configuraciones para este cable aunque lo más cómodo es usar un cable del fabricante cisco.

Cable CISCO Serial 2 RJ-45
Cable CISCO Serial 2 RJ-45

Una vez conectados por serial al router es necesario utilizar un programa que permita la conexión serial. En mi caso utilizo putty con los parámetros de conexión: “Baud rate: 115200 Data bits: 8 Parity: NONE Stop bits: 1 Flow control: NONE“.

En la ventana de putty se pueder observar el proceso de inicio completo del dispositivo.

Looking for valid bootloader image....
Jumping to start of image at address 0xbfc80000


U-Boot 1.1.1 (UBNT Build ID: 4493936-g009d77b) (Build time: Sep 20 2012 - 15:48:51)

BIST check passed.
UBNT_E100 r1:2, r2:12, serial #: ---------------
Core clock: 500 MHz, DDR clock: 266 MHz (532 Mhz data rate)
DRAM:  512 MB
Clearing DRAM....... done
Flash:  4 MB
Net:   octeth0, octeth1, octeth2

USB:   (port 0) scanning bus for devices... 1 USB Devices found
       scanning bus for storage devices...
  Device 0: Vendor: USB Mass Prod.: Storage Device   Rev:
            Type: Removable Hard Disk
            Capacity: 971.5 MB = 0.9 GB (1989632 x 512)                                                                                                                        0
reading vmlinux.64
..................................

6865928 bytes read
argv[2]: coremask=0x3
argv[3]: root=/dev/sda2
argv[4]: rootdelay=15
argv[5]: rw
argv[6]: rootsqimg=squashfs.img
argv[7]: rootsqwdir=w
argv[8]: mtdparts=phys_mapped_flash:512k(boot0),512k(boot1),64k@3072k(eeprom)
ELF file is 64 bit
Allocating memory for mapped kernel segment, alignment: 0x400000
Allocated memory for ELF segment: addr: 0x400000, size 0x7de180
Processing PHDR 0
  Loading 68ae00 bytes at 400000
  Clearing 153380 bytes at a8ae00
## Loading Linux kernel with entry point: 0x008e7cd0 ...
Bootloader: Done loading app on coremask: 0x3
Linux version 3.10.20-UBNT (root@ubnt-builder2) (gcc version 4.7.0 (Cavium Inc. Version: SDK_3_1_0_p2 build 34) ) #1 SMP Tue Jun 16 12:05:05 PDT 2015
CVMSEG size: 2 cache lines (256 bytes)
Cavium Inc. SDK-3.1
bootconsole [early0] enabled
CPU revision is: 000d0601 (Cavium Octeon+)
Checking for the multiply/shift bug... no.
Checking for the daddiu bug... no.
Determined physical RAM map:
 memory: 0000000007400000 @ 0000000000c00000 (usable)
 memory: 0000000007c00000 @ 0000000008200000 (usable)
 memory: 000000000fc00000 @ 0000000410000000 (usable)
 memory: 0000000000648000 @ 0000000000400000 (usable)
 memory: 0000000000048000 @ 0000000000a48000 (usable after init)
Wasting 57344 bytes for tracking 1024 unused pages
software IO TLB [mem 0x01707000-0x01747000] (0MB) mapped at [8000000001707000-8000000001746fff]
Zone ranges:
  DMA32    [mem 0x00400000-0xefffffff]
  Normal   [mem 0xf0000000-0x41fbfffff]
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x00400000-0x00a8ffff]
  node   0: [mem 0x00c00000-0x07ffffff]
  node   0: [mem 0x08200000-0x0fdfffff]
  node   0: [mem 0x410000000-0x41fbfffff]
Primary instruction cache 32kB, virtually tagged, 4 way, 64 sets, linesize 128 bytes.
Primary data cache 16kB, 64-way, 2 sets, linesize 128 bytes.
Secondary unified cache 128kB, 8-way, 128 sets, linesize 128 bytes.
PERCPU: Embedded 10 pages/cpu @8000000001784000 s11776 r8192 d20992 u40960
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 125887
Kernel command line:  bootoctlinux $loadaddr coremask=0x3 root=/dev/sda2 rootdelay=15 rw rootsqimg=squashfs.img rootsqwdir=w mtdparts=phys_mapped_flash:512k(boot0),512k(boot1),64k@3072k(eeprom) console=ttyS0,115200
PID hash table entries: 2048 (order: 2, 16384 bytes)
Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
Memory: 495244k/510528k available (5073k kernel code, 15284k reserved, 1355k data, 288k init, 0k highmem)
Hierarchical RCU implementation.
        Additional per-CPU info printed with stalls.
NR_IRQS:255
Calibrating delay loop (skipped) preset value.. 1000.00 BogoMIPS (lpj=5000000)
pid_max: default: 32768 minimum: 501
Security Framework initialized
Mount-cache hash table entries: 256
Checking for the daddi bug... no.
SMP: Booting CPU01 (CoreId  1)...
CPU revision is: 000d0601 (Cavium Octeon+)
Brought up 2 CPUs
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Switching to clocksource OCTEON_CVMCOUNT
NET: Registered protocol family 2
TCP established hash table entries: 4096 (order: 4, 65536 bytes)
TCP bind hash table entries: 4096 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP: reno registered
UDP hash table entries: 256 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
NET: Registered protocol family 1
octeon_pci_console: Console not created.
/proc/octeon_perf: Octeon performance counter interface loaded
HugeTLB registered 2 MB page size, pre-allocated 0 pages
squashfs: version 4.0 (2009/01/31) Phillip Lougher
Registering unionfs 2.5.13 (for 3.10.34)
msgmni has been set to 967
io scheduler noop registered
io scheduler cfq registered (default)
Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
1180000000800.serial: ttyS0 at MMIO 0x1180000000800 (irq = 34) is a OCTEON
console [ttyS0] enabled, bootconsole disabled
console [ttyS0] enabled, bootconsole disabled
1180000000c00.serial: ttyS1 at MMIO 0x1180000000c00 (irq = 35) is a OCTEON
loop: module loaded
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
OcteonUSB 16f0010000000.usbc: Octeon Host Controller
OcteonUSB 16f0010000000.usbc: new USB bus registered, assigned bus number 1
OcteonUSB 16f0010000000.usbc: irq 56, io mem 0x00000000
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
OcteonUSB: Registered HCD for port 0 on irq 56
usbcore: registered new interface driver usb-storage
octeon_wdt: Initial granularity 5 Sec
TCP: cubic registered
NET: Registered protocol family 17
NET: Registered protocol family 15
Bootbus flash: Setting flash for 4MB flash at 0x1f800000
phys_mapped_flash: Found 1 x16 devices at 0x0 in 8-bit bank. Manufacturer ID 0x0000c2 Chip ID 0x0000a7
Amd/Fujitsu Extended Query Table at 0x0040
  Amd/Fujitsu Extended Query version 1.1.
phys_mapped_flash: Swapping erase regions for top-boot CFI table.
number of CFI chips: 1
3 cmdlinepart partitions found on MTD device phys_mapped_flash
Creating 3 MTD partitions on "phys_mapped_flash":
0x000000000000-0x000000080000 : "boot0"
0x000000080000-0x000000100000 : "boot1"
0x000000300000-0x000000310000 : "eeprom"
Waiting 15sec before mounting root device...
usb 1-1: new high-speed USB device number 2 using OcteonUSB
usb-storage 1-1:1.0: USB Mass Storage device detected
scsi0 : usb-storage 1-1:1.0
scsi 0:0:0:0: Direct-Access     USB Mass Storage Device        PQ: 0 ANSI: 0 CCS
sd 0:0:0:0: [sda] 1989632 512-byte logical blocks: (1.01 GB/971 MiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] No Caching mode page found
sd 0:0:0:0: [sda] Assuming drive cache: write through
sd 0:0:0:0: [sda] No Caching mode page found
sd 0:0:0:0: [sda] Assuming drive cache: write through
 sda: sda1 sda2
sd 0:0:0:0: [sda] No Caching mode page found
sd 0:0:0:0: [sda] Assuming drive cache: write through
sd 0:0:0:0: [sda] Attached SCSI removable disk
kjournald starting.  Commit interval 3 seconds
EXT3-fs (sda2): using internal journal
EXT3-fs (sda2): mounted filesystem with journal data mode
VFS: Mounted root (unionfs filesystem) on device 0:11.
Freeing unused kernel memory: 288K (ffffffffc0648000 - ffffffffc0690000)
Algorithmics/MIPS FPU Emulator v1.5
INIT: version 2.88 booting
INIT: Entering runlevel: 2
[ ok ] Starting routing daemon: rib.
[ ok ] Starting EdgeOS router: migrate rl-system configure.

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